CN114757124A - CFD workflow modeling method and device based on XML, computer and storage medium - Google Patents

Abstract

An XML-based CFD workflow modeling method, device, computer and storage medium relate to the field of scientific computing. It solves the problem that the existing scientific computing workflow is not suitable for fluid mechanics. The modeling method includes: obtaining an input parameter file according to the parsing XML file; performing geometric modeling according to the input parameter file, and obtaining a geometric model file, where the geometric model file is an output attribute of a geometric component node model; meshing according to the geometric model Divide, obtain a grid file, the grid file is the output attribute of the grid component node model; perform the solution calculation according to the input parameter file and the grid file, and obtain the solution result, the solution result is the solver component node model. output attribute; the post-processing rendering image is obtained according to the solution result, and the establishment of the CFD workflow model is completed; the post-processing rendering image is the output attribute of the post-processing component node model. The field of scientific computing workflows applicable to fluid mechanics.

Description

An XML-based CFD workflow modeling method, device, computer and storage medium

technical field

The present invention relates to the field of fluid simulation technology in the technical field of fluid mechanics.

Background technique

Scientific computing workflow provides functions such as process definition and control, task management, job scheduling and execution, and fault-tolerant processing, shielding underlying resources, helping scientific researchers reduce the time spent on process deployment operations, and improving the efficiency of problem solving. Typical scientific workflow systems such as Kepler (Kepler) require a lot of time to be familiar with the meaning of various active nodes, while other integration methods such as HSWAP (a numerical simulation workflow management platform for high-performance computing environments) For the field of CFD (Computational Fluid Dynamics), there is no analysis and summary of its data coupling method, and the integration method based on STEP (Product Model Data Interaction Specification) and the integration method based on Agent architecture are lacking in scalability.

At present, there is a lack of a scientific computing workflow suitable for the field of fluid mechanics, that is, there is no fluid simulation modeling technology suitable for fluid mechanics.

SUMMARY OF THE INVENTION

The invention solves the problem that the existing scientific computing workflow is not suitable for fluid mechanics.

An XML-based CFD workflow modeling method, the modeling method comprising:

Obtain the input parameter file according to the parsing XML file;

Perform geometric modeling according to the input parameter file, and obtain a geometric model file, where the geometric model file is the output attribute of the geometric component node model;

Perform mesh division according to the geometric model, and obtain a mesh file, where the mesh file is the output attribute of the mesh component node model;

Perform the solution calculation according to the input parameter file and the grid file, and obtain the solution result, where the solution result is the output attribute of the node model of the solver component;

The post-processing rendering image is obtained according to the solution result, and the establishment of the CFD workflow model is completed; the post-processing rendering image is the output attribute of the post-processing component node model.

Further, the geometric component node model, grid component model, solver node model and post-processing component node model all include: object attributes, execution actions and object ports;

The object attribute is used to describe the relevant parameters of the workflow node;

The execution action is used to describe the behavior action of the workflow node;

The object port is used to describe the data input and data output of the workflow node, the data input means that the data required by the workflow node is input through the input port, and the data output means that the data generated by the workflow node is passed through the output port, transfer to the next node.

Further, the CFD workflow model includes a root element;

The root element includes three attributes: name attribute, desp attribute and type attribute;

The name attribute is used to describe the name of the workflow model;

The desp attribute is used to describe the information of the workflow model, and provides the descriptive text of the workflow model;

The type attribute is used to describe the type of workflow model.

Further, the root element also includes four sub-elements: sub-element Property, sub-element Step, sub-element Relation and sub-element Link;

The sub-element Property is used to describe the attribute information of the workflow model itself;

The sub-element Step is used to describe the node information in the workflow model, and the one workflow model contains at least two sub-elements Step to describe the workflow node, and the two sub-elements Step are respectively the start node and the end node;

The sub-element Relation is used to describe the connection information of each node in the workflow model, and does not have a direction attribute;

The sub-element Link is used to associate the input port and the output port between the nodes.

Further, the sub-element Property includes:

Sub-element Author, sub-element CreateTime, sub-element Location;

The sub-element Author is used to describe the author of the workflow model;

The sub-element CreateTime is used to describe the creation time of the workflow model;

The sub-element Location is used to describe the storage location of the workflow model.

Further, the sub-element Step includes: attribute name, attribute desp, attribute id and attribute type;

The attribute name is used to describe the name of the node corresponding to the child element Step, and in the entire workflow model, the name of the node is unique and cannot be repeated;

The attribute desp is used to describe the description information of the node corresponding to the sub-element Step, and provides the descriptive text of the corresponding node;

The attribute id is used as an identifier to identify the node;

The attribute type is used to describe the type of the workflow node and determine the work content of the workflow node.

Further, the sub-element Step also includes: the sub-element label Property of the node label, the sub-element label Actions of the node label and the sub-element label Ports of the node label;

The child element label Property of the node label is used to describe the attribute information contained in the node class;

The sub-element label Actions of the node label is used to describe the set of all operations supported by the node;

The sub-element label Ports of the node label is used to indicate a channel for inputting data to the node and a channel for outputting data from the node.

Based on the same concept, the present invention also provides a CFD workflow modeling device based on XML, and the modeling device includes:

The parsing unit is used to obtain the input parameter file according to the parsing XML file;

a geometric modeling unit, configured to perform geometric modeling according to the input parameter file, and obtain a geometric model file, where the geometric model file is the output attribute of the geometric component node model;

a grid file acquiring unit, used for performing grid division according to the geometric model to acquire a grid file, where the grid file is an output attribute of a grid component node model;

a solution result obtaining unit, configured to perform solution calculation according to the input parameter file and the grid file, and obtain the solution result, where the solution result is the output attribute of the node model of the solver component;

The post-processing unit is used for obtaining a post-processing rendering image according to the solution result, and completing the establishment of the CFD workflow model; the post-processing rendering image is an output attribute of the post-processing component node model.

The present invention also provides a computer device, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program stored in the memory, the processor executes one of the above-mentioned methods. An XML-based CFD workflow modeling method.

The present invention also provides a computer-readable storage medium for storing a computer program, and the computer program executes the above-mentioned XML-based CFD workflow modeling method.

The benefits of the present invention are:

(1) The present invention defines a set of semantic grammar specifications based on XML extensible markup language, constructs a scientific computing workflow oriented to the technical field of fluid mechanics, and forms a set of formalized CFD model establishment and description methods.

(2) The nodes of the formalized description language of typical scientific workflow are complex, and it takes a lot of time to get familiar with the meanings of various active nodes. The XML-based semantic grammar specification of the present invention focuses on describing the spatial physical characteristics and unsteady characteristics of fluid motion. A model of the spatiotemporal physical characteristics of fluid motion, which is more suitable for operational use.

(3) The present invention provides special components for the technical field of fluid mechanics, including business nodes such as geometry, grid, solver, post-processing, etc. The established CFD workflow model can integrate existing scientific computing tasks developed in multiple languages ;Support integrity, logic and consistency check, realize static check of workflow, find errors in advance, and reduce the time of error checking when the workflow is running.

(4) Based on the modeling method constructed by the present invention, a custom workflow component can be developed, extended, and encapsulated with its own logic. The entire workflow can be well compatible and support the calling of the custom component, which is convenient for users to use .

The invention is suitable for the scientific computing workflow field of fluid mechanics.

Description of drawings

FIG. 1 is a flowchart of an XML-based CFD workflow modeling method according to the present invention.

FIG. 2 is a flowchart of a judgment component according to Embodiment 6 of the present invention.

FIG. 3 is a flow chart of the circulation component according to the sixth embodiment of the present invention.

FIG. 4 is a schematic diagram of a description file of a workflow model according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments.

Embodiment 1 This embodiment is described with reference to FIG. 1 . The XML-based CFD workflow modeling method described in this embodiment includes:

Obtain the input parameter file according to the parsing XML file;

Perform geometric modeling according to the input parameter file, and obtain a geometric model file, where the geometric model file is the output attribute of the geometric component node model;

Perform mesh division according to the geometric model, and obtain a mesh file, where the mesh file is the output attribute of the mesh component node model;

Perform the solution calculation according to the input parameter file and the grid file, and obtain the solution result, where the solution result is the output attribute of the node model of the solver component;

The post-processing rendering image is obtained according to the solution result, and the establishment of the CFD workflow model is completed; the post-processing rendering image is the output attribute of the post-processing component node model.

In practical applications, the geometric component node model encapsulates common operations and data configuration items in the geometric modeling stage in the field of scientific computing, which facilitates the operation of input data and output data related to geometric modeling; the grid component node model It encapsulates common operations and data configuration items in the meshing stage in the field of scientific computing, and can provide meshing operations for geometric models; the solver node model encapsulates the common operations and data configuration items in the finite element solution calculation stage in the field of scientific computing. Operation and data configuration items, which can provide the solution calculation process for input parameter files and grid files; the post-processing component node model encapsulates common operations and data configuration items in the post-processing visualization stage in the field of scientific computing, and can output the solver The calculation result file of the cloud map, vector diagram, isosurface and other common post-processing rendering images are presented through visual technical means (calls of common software).

Each basic component node model is defined in the form of a C++ class and used as a basic component node object. The workflow model framework partially supports the extension of the basic component model, which is reflected in the actual operation as the inheritance of the basic component class. By integrating different types of basic component classes, the final required subclass type can be written. After loading in the framework, it can be combined with The base components are displayed together.

The basic component model and the extended component model based on the basic component model can be implemented by encapsulating the Widget interface, and the Widget interface part mainly implements the collection of attribute information of the node.

Embodiment 2. This embodiment further defines the XML-based CFD workflow modeling method described in Embodiment 1. The geometric component node model, grid component node model, solver node model and post-processing The component node model includes: object properties, execution actions and object ports;

The object attribute is used to describe the relevant parameters of the workflow node;

The execution action is used to describe the behavior action of the workflow node;

The object port is used to describe the data input and data output of the workflow node, the data input means that the data required by the workflow node is input through the input port, and the data output means that the data generated by the workflow node is passed through the output port, transfer to the next node.

In practical applications, the relevant parameters may be node state information, input parameter information, output parameter information, intermediate result data, and the like.

The execution animal is specifically the pre-action before entering the workflow node, the node action after entering the workflow node, the post-action after leaving the workflow node, etc.; the three types of actions can all use python scripts or shell scripts In the form of representation, the specific execution is processed in the execution engine.

The object port can access the data required by the node through the input port, and can also transmit the data generated by the node to the next node through the output port. A port is a data transmission channel between nodes, in which the transmitted data is realized by binding the properties of the node object.

Embodiment 3. This embodiment further defines the XML-based CFD workflow modeling method described in Embodiment 2, where the CFD workflow model includes a root element;

The root element includes three attributes: name attribute, desp attribute and type attribute;

The name attribute is used to describe the name of the workflow model;

The desp attribute is used to describe the information of the workflow model, and provides the descriptive text of the workflow model;

The type attribute is used to describe the type of workflow model.

The detailed description of the three properties is shown in Table 1:

Table 1

In practical applications, the workflow node description file is embodied in the form of XML.

Embodiment 4. This embodiment further defines the XML-based CFD workflow modeling method described in Embodiment 3. The root element further includes four sub-elements: sub-element Property, sub-element Step, sub-element Relation and child element Link;

The sub-element Property is used to describe the attribute information of the workflow model itself;

The sub-element Step is used to describe the node information in the workflow model, and the one workflow model contains at least two sub-elements Step to describe the workflow node, and the two sub-elements Step are respectively the start node and the end node;

The sub-element Relation is used to describe the connection information of each node in the workflow model, and does not have a direction attribute;

The sub-element Link is used to associate the input and output ports between nodes.

The detailed description of the sub-element Relation is shown in Table 2:

Table 2

The sub-element Link can reflect the relationship between the input ports and output ports of the nodes with the connection relationship. In general, a connection line is associated with two nodes, one end is the input port of one node, and the other end is the output port of the other node.

The detailed description of the sub-element Link is shown in Table 3:

table 3

Embodiment 5. This embodiment is described with reference to FIG. 4 . This embodiment further defines the XML-based CFD workflow modeling method described in Embodiment 4, and the sub-element Property includes:

Sub-element Author, sub-element CreateTime, sub-element Location;

The sub-element Author is used to describe the author of the workflow model;

The sub-element CreateTime is used to describe the creation time of the workflow model;

The sub-element Location is used to describe the storage location of the workflow model.

In actual use, the detailed description of the sub-element Property is shown in Table 4:

Table 4

Embodiment 6 This embodiment will be described with reference to FIG. 2 , FIG. 3 and FIG. 4 . This embodiment further defines the XML-based CFD workflow modeling method described in the fourth embodiment, and the sub-element Step includes: attribute name, attribute desp, attribute id and attribute type;

The attribute name is used to describe the name of the node corresponding to the child element Step, and in the entire workflow model, the name of the node is unique and cannot be repeated;

The attribute desp is used to describe the description information of the node corresponding to the sub-element Step, and provides the descriptive text of the corresponding node;

The attribute id is used as an identifier to identify the node;

The attribute type is used to describe the type of the workflow node and determine the work content of the workflow node.

In practical applications, the attribute type includes 12 basic component types, namely: start node WFBeginStep, geometry node WFGeoStep, mesh node WFMeshStep, solve node WFSolverStep, post-processing node WFPostStep, conditional branch node WFConditionStep, loop node WFLoopStep, parallel start Node WFParalBeginStep, Parallel End Node WFParalEndStep, Custom Node WFCustomizeStep, and End Node WFEndStep.

Among them, the geometric node WFGeoStep, the mesh node WFMeshStep, the solving node WFSolverStep and the post-processing node WFPostStep are service nodes.

In actual use, a workflow description file contains at least a start node WFBeginStep and an end node WFEndStep to describe the workflow node.

The parallel start node WFParalBeginStep and the parallel end node WFParalEndStep are for the purpose of optimizing the design process business, there are two branch processes to improve the calculation efficiency, and the calculation is performed by starting n sub-processes in parallel (n is an integer greater than or equal to 1). The calculation process of each sub-process is the same, and the calculation data between each sub-process does not interfere with each other; the process defined between the parallel start node and the parallel end node is the sub-process that needs to be started in parallel, and the parallel start node and the parallel end node need a A correspondence.

The detailed description of the sub-processes started in parallel is shown in Table 5:

table 5

The CFD scientific calculation only allows one start node and one end node. When multiple branches appear in the running process, each branch process needs to be aggregated into a trunk process before the end. The node that aggregates the branch processes is a sink node WFAndOrStep, also called an AND-OR node; the detailed description of the sink node WFAndOrStep is shown in Table 6:

Table 6

In the operation process, which branch flow to take is determined according to the operation result. The conditional branch node has one more conditional judgment action than other nodes. The program/script executed in the conditional judgment action returns a Result attribute after execution. The system judges which branch to take according to the Result attribute, and the judgment node is the WFConditionStep conditional branch node; The detailed description of the WFConditionStep conditional branch node is shown in Table 7:

Table 7

In actual practice, according to business needs, execute an operation loop n times (n is an integer greater than or equal to 1), and use the loop node WFLoopStep. The detailed description of the loop node WFLoopStep is shown in Table 8:

Table 8

When the system allows users to develop their own custom components to extend the functional components of the system. After the custom component is loaded into the system, the user can use the custom component to configure the workflow to generate a custom node WFCustomizeStep; the detailed description of the custom node WFCustomizeStep is shown in Table 9:

Table 9

Embodiment 7 This embodiment will be described with reference to FIG. 4 . This embodiment further defines the XML-based CFD workflow modeling method described in Embodiment 4. The sub-element Step further includes: the sub-element tag Property of the node tag, the sub-element tag Actions of the node tag and The child element label Ports of the node label;

The child element label Property of the node label is used to describe the attribute information contained in the node class;

The sub-element label Actions of the node label is used to describe the set of all operations supported by the node;

The sub-element label Ports of the node label is used to indicate a channel for inputting data to the node and a channel for outputting data from the node.

In actual use, the sub-element tag Property currently supports two types of sub-element tags: one is the Param tag, the Param tag is used to identify the variable data used in the node class; the other is the File tag, the The File tag is used to identify the file used in the node class.

Each attribute of the Param tag is given a detailed description as shown in Table 10:

Table 10

Each attribute of the File tag is given a detailed description as shown in Table 11:

Table 11

The Action tag contains multiple attributes and sub-element tags, the details are shown in Table 12:

Table 12

The sub-element label Ports is a collection of node data channels, and the detailed description of the sub-element label Ports is as shown in Table 13:

Table 13

Embodiment 8. An XML-based CFD workflow modeling device described in this embodiment, the modeling device includes:

The parsing unit is used to obtain the input parameter file according to the parsing XML file;

a geometric modeling unit, configured to perform geometric modeling according to the input parameter file, and obtain a geometric model file, where the geometric model file is the output attribute of the geometric component node model;

a grid file acquiring unit, used for performing grid division according to the geometric model to acquire a grid file, where the grid file is an output attribute of a grid component node model;

a solution result obtaining unit, configured to perform solution calculation according to the input parameter file and the grid file, and obtain the solution result, where the solution result is the output attribute of the node model of the solver component;

The post-processing unit is configured to obtain a post-processing rendering image according to the solution result, and complete the establishment of the CFD workflow model; the post-processing rendering image is an output attribute of the post-processing component node model.

Embodiment 9. A computer device according to this embodiment includes a memory and a processor, where a computer program is stored in the memory. When the processor executes the computer program stored in the memory, the processor executes the computer program. According to an XML-based CFD workflow modeling method described in any one of Embodiments 1 to 7.

Embodiment 10. A computer-readable storage medium described in this embodiment, the computer-readable storage medium is used to store a computer program, and the computer program executes the one described in any one of Embodiments 1 to 7 XML-based CFD workflow modeling method.

Claims (10)

1. a CFD workflow modeling method based on XML, is characterized in that, described modeling method comprises: Obtain the input parameter file according to the parsing XML file; Perform geometric modeling according to the input parameter file, and obtain a geometric model file, where the geometric model file is the output attribute of the geometric component node model; Perform mesh division according to the geometric model, and obtain a mesh file, where the mesh file is the output attribute of the mesh component node model; Perform the solution calculation according to the input parameter file and the grid file, and obtain the solution result, where the solution result is the output attribute of the node model of the solver component; The post-processing rendering image is obtained according to the solution result, and the CFD workflow modeling is completed; the post-processing rendering image is the output attribute of the post-processing component node model. 2. a kind of XML-based CFD workflow modeling method according to claim 1, is characterized in that, described geometry component node model, grid component model, solver node model and post-processing component node model all comprise: Object properties, execution actions, and object ports; The object attribute is used to describe the relevant parameters of the workflow node; The execution action is used to describe the behavior action of the workflow node; The object port is used to describe the data input and data output of the workflow node, the data input means that the data required by the workflow node is input through the input port, and the data output means that the data generated by the workflow node is passed through the output port, transfer to the next node. 3. a kind of XML-based CFD workflow modeling method according to claim 1, is characterized in that, described CFD workflow model comprises root element; The root element includes three attributes: name attribute, desp attribute and type attribute; The name attribute is used to describe the name of the workflow model; The desp attribute is used to describe the information of the workflow model, and provides the descriptive text of the workflow model; The type attribute is used to describe the type of workflow model. 4. a kind of XML-based CFD workflow modeling method according to claim 3, is characterized in that, described root element also comprises four sub-elements: sub-element Property, sub-element Step, sub-element Relation and sub-element Link; The sub-element Property is used to describe the attribute information of the workflow model itself; The sub-element Step is used to describe the node information in the workflow model, and the one workflow model contains at least two sub-elements Step to describe the workflow nodes, and the two sub-elements Step are respectively the start node and the end node; The sub-element Relation is used to describe the connection information of each node in the workflow model, and does not have a direction attribute; The sub-element Link is used to associate the input port and the output port between the nodes. 5. a kind of XML-based CFD workflow modeling method according to claim 4, is characterized in that, described sub-element Property comprises: Sub-element Author, sub-element CreateTime, sub-element Location; The sub-element Author is used to describe the author of the workflow model; The sub-element CreateTime is used to describe the creation time of the workflow model; The sub-element Location is used to describe the storage location of the workflow model. 6. a kind of XML-based CFD workflow modeling method according to claim 4, is characterized in that, described sub-element Step comprises: attribute name, attribute desp, attribute id and attribute type; The attribute name is used to describe the name of the node corresponding to the child element Step, and in the entire workflow model, the name of the node is unique and cannot be repeated; The attribute desp is used to describe the description information of the node corresponding to the sub-element Step, and provides the descriptive text of the corresponding node; The attribute id is used as an identifier to identify the node; The attribute type is used to describe the type of the workflow node and determine the work content of the workflow node. 7. a kind of XML-based CFD workflow modeling method according to claim 4, is characterized in that, described child element Step also comprises: the child element label Property of node label, the child element label Actions and node label of node label The label's child element label Ports; The child element label Property of the node label is used to describe the attribute information contained in the node class; The sub-element label Actions of the node label is used to describe the set of all operations supported by the node; The sub-element label Ports of the node label is used to indicate a channel for inputting data to the node and a channel for outputting data from the node. 8. A CFD workflow modeling device based on XML, characterized in that, the modeling device comprises: The parsing unit is used to obtain the input parameter file according to the parsing XML file; a geometric modeling unit, configured to perform geometric modeling according to the input parameter file, and obtain a geometric model file, where the geometric model file is the output attribute of the geometric component node model; Meshing performs meshing according to the geometric model, and obtains a mesh file, where the mesh file is the output attribute of the mesh component node model; Perform the solution calculation according to the input parameter file and the grid file, and obtain the solution result, where the solution result is the output attribute of the node model of the solver component; The post-processing rendering image is obtained according to the solution result, and the CFD workflow modeling is completed; the post-processing rendering image is the output attribute of the post-processing component node model. 9. A computer device, characterized in that it comprises a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program stored in the memory, the processor executes the program according to claim 1. An XML-based CFD workflow modeling method described in any one of -7. 10. A computer-readable storage medium, characterized in that, the computer-readable storage medium is used to store a computer program, and the computer program executes a kind of XML-based CFD work according to any one of claims 1-7 Flow Modeling Methods.

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