* Departamento de Engenharia Mecânica Universidade Federal do Paraná Caixa postal 19040 CEP 815... more * Departamento de Engenharia Mecânica Universidade Federal do Paraná Caixa postal 19040 CEP 81531-990 Curitiba, PR, Brasil e-mail: marchi@cce.ufpr.br, web page: http://www.demec .ufpr.br/departamento/professores/marchi.htm Departamento de Engenharia Mecânica ...
Http Dx Doi Org 10 1080 10407780490424307, Aug 17, 2010
A one-dimensional mathematical model is presented for flows in a rocket engine that has a regener... more A one-dimensional mathematical model is presented for flows in a rocket engine that has a regenerative cooling system. The problem involves the flow of a gas in a converging-diverging nozzle, the flow of a coolant in channels distributed around the engine, and the ...
Journal of Aerospace Engineering, Sciences and Applications, 2008
a one-dimensional mathematical and numerical model for the flow in a LOX/LH2-rocket engine nozzle... more a one-dimensional mathematical and numerical model for the flow in a LOX/LH2-rocket engine nozzle is presented. Temperature is used as unknown at energy equation and velocity is obtained for all speeds regimes. For all analyses, tiny tolerances and a large number of iterations were used, in order to achieve the round-off error and estimate the discretization error. For each physical
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2009
The problem of flow inside a square cavity whose lid has constant velocity is solved. This proble... more The problem of flow inside a square cavity whose lid has constant velocity is solved. This problem is modeled by the Navier-Stokes equations. The numerical model is based on the finite volume method with numerical approximations of second-order accuracy and ...
Numerical Heat Transfer, Part B: Fundamentals, 1994
... 295 speed flows follows the idea in Patankar [14] and in Harlow and Amsden [IS], and further ... more ... 295 speed flows follows the idea in Patankar [14] and in Harlow and Amsden [IS], and further explored in Van Doormaal [16] for one-and two-dimensional flows in Cartesian coordinates, in Silva and Maliska [17], Maliska and Silva [18], and Karki and Patankar [I91 for two ...
Numerical Heat Transfer, Part B: Fundamentals, 2008
In this work an empirical estimator is used to estimate the iteration error based on the converge... more In this work an empirical estimator is used to estimate the iteration error based on the convergence rate of the variable of interest. Problems of heat transfer and of fluid mechanics are solved by the finite-difference and finite-volume methods using various iteration methods. In the initial iterations the accuracy of the empirical estimator is usually low; when the number of
Numerical Heat Transfer, Part B: Fundamentals, 2002
Page 1. UNIDIMENSIONAL NUMERICAL SOLUTION ERROR ESTIMATION FOR CONVERGENT APPARENT ORDER Carlos H... more Page 1. UNIDIMENSIONAL NUMERICAL SOLUTION ERROR ESTIMATION FOR CONVERGENT APPARENT ORDER Carlos Henrique Marchi Department of Mechanical Engineering, Federal University of ParanaÂ, Curitiba, ParanaÂ, Brazil ...
* Departamento de Engenharia Mecânica Universidade Federal do Paraná Caixa postal 19040 CEP 815... more * Departamento de Engenharia Mecânica Universidade Federal do Paraná Caixa postal 19040 CEP 81531-990 Curitiba, PR, Brasil e-mail: marchi@cce.ufpr.br, web page: http://www.demec .ufpr.br/departamento/professores/marchi.htm Departamento de Engenharia Mecânica ...
Http Dx Doi Org 10 1080 10407780490424307, Aug 17, 2010
A one-dimensional mathematical model is presented for flows in a rocket engine that has a regener... more A one-dimensional mathematical model is presented for flows in a rocket engine that has a regenerative cooling system. The problem involves the flow of a gas in a converging-diverging nozzle, the flow of a coolant in channels distributed around the engine, and the ...
Journal of Aerospace Engineering, Sciences and Applications, 2008
a one-dimensional mathematical and numerical model for the flow in a LOX/LH2-rocket engine nozzle... more a one-dimensional mathematical and numerical model for the flow in a LOX/LH2-rocket engine nozzle is presented. Temperature is used as unknown at energy equation and velocity is obtained for all speeds regimes. For all analyses, tiny tolerances and a large number of iterations were used, in order to achieve the round-off error and estimate the discretization error. For each physical
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2009
The problem of flow inside a square cavity whose lid has constant velocity is solved. This proble... more The problem of flow inside a square cavity whose lid has constant velocity is solved. This problem is modeled by the Navier-Stokes equations. The numerical model is based on the finite volume method with numerical approximations of second-order accuracy and ...
Numerical Heat Transfer, Part B: Fundamentals, 1994
... 295 speed flows follows the idea in Patankar [14] and in Harlow and Amsden [IS], and further ... more ... 295 speed flows follows the idea in Patankar [14] and in Harlow and Amsden [IS], and further explored in Van Doormaal [16] for one-and two-dimensional flows in Cartesian coordinates, in Silva and Maliska [17], Maliska and Silva [18], and Karki and Patankar [I91 for two ...
Numerical Heat Transfer, Part B: Fundamentals, 2008
In this work an empirical estimator is used to estimate the iteration error based on the converge... more In this work an empirical estimator is used to estimate the iteration error based on the convergence rate of the variable of interest. Problems of heat transfer and of fluid mechanics are solved by the finite-difference and finite-volume methods using various iteration methods. In the initial iterations the accuracy of the empirical estimator is usually low; when the number of
Numerical Heat Transfer, Part B: Fundamentals, 2002
Page 1. UNIDIMENSIONAL NUMERICAL SOLUTION ERROR ESTIMATION FOR CONVERGENT APPARENT ORDER Carlos H... more Page 1. UNIDIMENSIONAL NUMERICAL SOLUTION ERROR ESTIMATION FOR CONVERGENT APPARENT ORDER Carlos Henrique Marchi Department of Mechanical Engineering, Federal University of ParanaÂ, Curitiba, ParanaÂ, Brazil ...
Journal of Aerospace Technology and Management, 2015
The potassium nitrate (KNO 3)/sucrose (C 12 H 22 O 11) propellant, known as KNSu, is traditionall... more The potassium nitrate (KNO 3)/sucrose (C 12 H 22 O 11) propellant, known as KNSu, is traditionally used in rocket studies by amateur groups. Performance tests of KNSu, whose composition is 65 wt% KNO 3 and 35 wt% C 12 H 22 O 11 , cold-manufactured by mechanical press, are presented in this paper. The study determines the behaviour of density (ρ) and burning rate (r) as function of compression pressure (P c) for the propellant grain manufacturing. Forty-four samples were prepared and tested, for seven different values of P c. It was observed that ρ and r depend on P c , according to quadratic polynomial functions, and the mass flux per unit area is a constant.
Uploads
Papers by Carlos Marchi