OpenRadioss 2025.1.11
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idealgas.F
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23!||====================================================================
24!|| idealgas ../common_source/eos/idealgas.F
25!||--- called by ------------------------------------------------------
26!|| eosmain ../common_source/eos/eosmain.F
27!||====================================================================
28 SUBROUTINE idealgas(IFLAG ,NEL ,PM ,OFF ,EINT ,MU ,
29 2 ESPE ,DVOL ,DF ,VNEW ,MAT ,PSH ,
30 3 PNEW ,DPDM ,DPDE )
31C-----------------------------------------------
32C M o d u l e s
33C-----------------------------------------------
34C
35C-----------------------------------------------
36C D e s c r i p t i o n
37C-----------------------------------------------
38C This subroutine contains numerical solving
39C of IDEAL GAS EOS
40!----------------------------------------------------------------------------
41!! \details STAGGERED SCHEME IS EXECUTED IN TWO PASSES IN EOSMAIN : IFLG=0 THEN IFLG=1
42!! \details COLLOCATED SCHEME IS DOING A SINGLE PASS : IFLG=2
43!! \details
44!! \details STAGGERED SCHEME
45!! \details EOSMAIN / IFLG = 0 : DERIVATIVE CALCULATION FOR SOUND SPEED ESTIMATION c[n+1] REQUIRED FOR PSEUDO-VISCOSITY (DPDE:partial derivative, DPDM:total derivative)
46!! \details MQVISCB : PSEUDO-VISCOSITY Q[n+1]
47!! \details MEINT : INTERNAL ENERGY INTEGRATION FOR E[n+1] : FIRST PART USING P[n], Q[n], and Q[n+1] CONTRIBUTIONS
48!! \details EOSMAIN / IFLG = 1 : UPDATE P[n+1], T[N+1]
49!! \details INTERNAL ENERGY INTEGRATION FOR E[n+1] : LAST PART USING P[n+1] CONTRIBUTION
50!! \details (second order integration dE = -P.dV where P = 0.5(P[n+1] + P[n]) )
51!! \details COLLOCATED SCHEME
52!! \details EOSMAIN / IFLG = 2 : SINGLE PASS FOR P[n+1] AND DERIVATIVES
53!----------------------------------------------------------------------------
54C-----------------------------------------------
55C I m p l i c i t T y p e s
56C-----------------------------------------------
57#include "implicit_f.inc"
58#include "comlock.inc"
59C-----------------------------------------------
60C C o m m o n B l o c k s
61C-----------------------------------------------
62#include "param_c.inc"
63#include "com04_c.inc"
64#include "com06_c.inc"
65#include "com08_c.inc"
66#include "vect01_c.inc"
67#include "scr06_c.inc"
68C-----------------------------------------------
69C D u m m y A r g u m e n t s
70C-----------------------------------------------
71 INTEGER MAT(NEL), IFLAG, NEL
72 my_real PM(NPROPM,NUMMAT),
73 . off(nel) ,eint(nel) ,mu(nel) ,
74 . espe(nel) ,dvol(nel) ,df(nel) ,
75 . vnew(nel) ,pnew(nel) ,dpdm(nel),
76 . dpde(nel)
77 my_real, INTENT(INOUT) :: psh(nel)
78C-----------------------------------------------
79C L o c a l V a r i a b l e s
80C-----------------------------------------------
81 INTEGER I, MX
82 my_real :: P0,GAMMA,T0,E0,SPH,BB,DVV,PP
83C-----------------------------------------------
84C S o u r c e L i n e s
85C-----------------------------------------------
86 IF(iflag == 0) THEN
87 mx = mat(1)
88 e0 = pm(23,mx)
89 gamma = pm(32,mx)
90 p0 = pm(31,mx)
91 psh(1:nel) = pm(88,mx)
92 t0 = pm(35,mx)
93 sph = pm(69,mx)
94 DO i=1,nel
95 pp = (gamma-one)*(one+mu(i))*espe(i)
96 dpdm(i) = (gamma-one)*(espe(i)+pp*df(i)) !total derivative
97 dpde(i) = (gamma-one)*(one+mu(i)) !partial derivative
98 pnew(i) = (max(pp,zero)-psh(i))*off(i) ! P(mu[n+1],E[n])
99 ENDDO
100C-----------------------------------------------
101 ELSEIF(iflag == 1) THEN
102 mx = mat(1)
103 e0 = pm(23,mx)
104 gamma = pm(32,mx)
105 p0 = pm(31,mx)
106 psh(1:nel) = pm(88,mx)
107 t0 = pm(35,mx)
108 sph = pm(69,mx)
109 ! p1 = p(mu,E+dE) = (g-1)*(1+mu)*(E-dvv*(p0+p1)) where p1,p0 are total pressure (no pshift), dvv = DVOL/2/V0
110 DO i=1,nel
111 bb = (gamma-one)*(one+mu(i))
112 dpde(i) = bb !partial derivative
113 dvv = half*dvol(i)*df(i) / max(em15,vnew(i))
114 pnew(i) = bb*espe(i) / (one+bb*dvv) ! P(mu[n+1],E[n+1])
115 pnew(i) = (max(pnew(i),zero)-psh(i))*off(i)
116 eint(i) = eint(i) - half*dvol(i)*(pnew(i)+psh(i))
117 ENDDO
118C-----------------------------------------------
119 ELSEIF (iflag == 2) THEN
120 mx = mat(1)
121 e0 = pm(23,mx)
122 gamma = pm(32,mx)
123 p0 = pm(31,mx)
124 psh(1:nel) = pm(88,mx)
125 t0 = pm(35,mx)
126 sph = pm(69,mx)
127 DO i=1, nel
128 IF (vnew(i) > zero) THEN
129 pp = (gamma-one)*(one+mu(i))*espe(i) - psh(i)
130 dpdm(i) = (gamma-one)*(espe(i)+(pp+psh(i))*df(i)) !total derivative
131 dpde(i) = (gamma-one)*(one+mu(i)) !partial derivative
132 pnew(i) = pp
133 ENDIF
134 ENDDO
135 ENDIF
136C-----------------------------------------------
137 RETURN
138 END
idealgas
subroutine idealgas(iflag, nel, pm, off, eint, mu, espe, dvol, df, vnew, mat, psh, pnew, dpdm, dpde)
Definition idealgas.F:31
max
#define max(a, b)
Definition macros.h:21