File mttroot/mtt/lib/comp/compound/GasDynamics/RG/RG_cr.r artifact 2b2ce5b134 part of check-in ade2e4aa5c

%SUMMARY RG	CR for 2 port gas dymanics R: isentropic nozzle


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OPERATOR RG;

% Port 1 : Enthalpy flow
FOR ALL gamma,R,A,T_u,P_u,T_d,P_d
LET RG(gamma,R,A, flow, 1,
		T_u,effort,1,
		P_u,effort,2,
		T_d,effort,3,
		P_d,effort,4)
	 = A*( P_u/sqrt(T_u) )
           *sqrt( (2*gamma)/(R*(gamma-1)) )
           *sqrt( (P_d/P_u)^(2/gamma) - (P_d/P_u)^((1+gamma)/gamma) )
           *(gamma/(gamma-1))*R*T_u;

% Port 2 : Mass flow
FOR ALL gamma,R,A,T_u,P_u,T_d,P_d
LET RG(gamma,R,A, flow, 2,
		T_u,effort,1,
		P_u,effort,2,
		T_d,effort,3,
		P_d,effort,4)
	 = A*( P_u/sqrt(T_u) )
           *sqrt( (2*gamma)/(R*(gamma-1)) )
           *sqrt( (P_d/P_u)^(2/gamma) - (P_d/P_u)^((1+gamma)/gamma) );

% Port 3 : Enthalpy flow
FOR ALL gamma,R,A,T_u,P_u,T_d,P_d
LET RG(gamma,R,A, flow, 3,
		T_u,effort,1,
		P_u,effort,2,
		T_d,effort,3,
		P_d,effort,4)
	 = A*( P_u/sqrt(T_u) )
           *sqrt( (2*gamma)/(R*(gamma-1)) )
           *sqrt( (P_d/P_u)^(2/gamma) - (P_d/P_u)^((1+gamma)/gamma) )
           *(gamma/(gamma-1))*R*T_u;

% Port 4 : Mass flow
FOR ALL gamma,R,A,T_u,P_u,T_d,P_d
LET RG(gamma,R,A, flow, 4,
		T_u,effort,1,
		P_u,effort,2,
		T_d,effort,3,
		P_d,effort,4)
	 = A*( P_u/sqrt(T_u) )
           *sqrt( (2*gamma)/(R*(gamma-1)) )
           *sqrt( (P_d/P_u)^(2/gamma) - (P_d/P_u)^((1+gamma)/gamma) );


END;;