Tommaso Ruggeri
Università di Bologna, MATEMATICS, Faculty Member
- I am a Mathematical Physicist Emeritus Professor at University of Bologna (Italy)edit
Page 245. CENTRO INTERNAZIONALE MATEMATICO ESTIVO (CIME) " ENTROPY PRINCIPLE" AND MAIN FIELD FOR A NON LINEAR COVARIANT SYSTEM TOMMASO RUGGERI Page 246. ... [2] KO FRIEDRICHS and PD LAX, Proc. Nat. Acad. Sci. USA 68... more
Page 245. CENTRO INTERNAZIONALE MATEMATICO ESTIVO (CIME) " ENTROPY PRINCIPLE" AND MAIN FIELD FOR A NON LINEAR COVARIANT SYSTEM TOMMASO RUGGERI Page 246. ... [2] KO FRIEDRICHS and PD LAX, Proc. Nat. Acad. Sci. USA 68 1686-1688 (1971). ...
Research Interests:
ABSTRACT We study the six-field model of fluids (ET6) derived from extended thermodynamics. The six fields are the mass density, the velocity, the temperature, and the dynamic pressure (nonequilibrium pressure). We present the basic... more
ABSTRACT We study the six-field model of fluids (ET6) derived from extended thermodynamics. The six fields are the mass density, the velocity, the temperature, and the dynamic pressure (nonequilibrium pressure). We present the basic system of field equations of ET6. And we elucidate its characteristic features through the studies of the singular limit from polyatomic to monatomic rarefied gases, of hydrodynamic fluctuation, and of a hard-sphere system. Open problems remained in ET6 at present are also pointed out.
Research Interests:
ABSTRACT We study the shock wave structure in a rarefied polyatomic gas based on a simplified model of extended thermodynamics in which the dissipation is due only to the dynamic pressure. In this case the differential system is very... more
ABSTRACT We study the shock wave structure in a rarefied polyatomic gas based on a simplified model of extended thermodynamics in which the dissipation is due only to the dynamic pressure. In this case the differential system is very simple because it is a variant of Euler system with a new scalar equation for the dynamic pressure [T. Arima, S. Taniguchi, T. Ruggeri, and M. Sugiyama, Phys. Lett. A 376, 2799-2803 (2012)]. It is shown that this theory is able to describe the three types of the shock wave structure observed in experiments: the nearly symmetric shock wave structure (Type A, small Mach number), the asymmetric structure (Type B, moderate Mach number), and the structure composed of thin and thick layers (Type C, large Mach number).