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estiff

  1. C ESTIFF    SOURCE    BECC      11/05/26    21:15:24     6981
  2.       SUBROUTINE ESTIFF(
  3.      &     RHO, P, GAMMA, PC, E,
  4.      &     LOGDEB, LOGAN)
  5. *
  6. *************************************************************************
  7. *
  8. * project           :  CAST3M, EUROPLEXUS...
  9. *
  10. * name              :  e_stiff
  11. *
  12. * description       :  euler equations for a mixture of stiffened gases
  13. *                      flux in the non-reactive case.
  14. *
  15. *                      computation of the internal energy.
  16. *
  17. * language          :  fortran 77
  18. *
  19. * author            :  a. beccantini den/dm2s/sfme/ltmf
  20. *
  21. *************************************************************************
  22. *
  23. * called by         :
  24. *
  25. *
  26. *************************************************************************
  27. *
  28. ***** input
  29. *
  30. *     pc, gam        =  properties of the stiffened gas
  31. *
  32. *     rho, p,        = density, pressure
  33. *
  34. *     logdeb         = debugging ?
  35. *
  36. ***** output
  37. *
  38. *     e              = energy
  39. *
  40. *     logan          = anomaly ?
  41. *
  42. *************************************************************************
  43. *
  44. *     26/11/2009      created
  45. *     25/05/2011      evolution in CAST3M
  46. *
  47. *************************************************************************
  48. *
  49. * n.b.: all variables are declared
  50. *
  51. C      IMPLICIT NONE
  52.       IMPLICIT INTEGER(I-N)
  53.       REAL*8
  54.      &     RHO, P, PC, GAMMA, E
  55. *
  56. *     debugging ?
  57. *
  58.       LOGICAL LOGDEB, LOGAN
  59. *
  60.       IF (LOGDEB ) THEN
  61.          IF (GAMMA .LE. 1.0D0) THEN
  62.             WRITE(*,*) 'SUBROUTINE E_STIFF.F'
  63.             WRITE(*,*) 'ANOMALY DETECTED'
  64.             WRITE(*,*) 'GAMMA =', GAMMA
  65.             LOGAN = .TRUE.
  66.             GOTO 9999
  67.          ENDIF
  68.          IF ((P .LT. 0.0D0) .OR. (PC .LT. 0.0D0)) THEN
  69.             WRITE(*,*) 'SUBROUTINE E_STIFF.F'
  70.             WRITE(*,*) 'ANOMALY DETECTED'
  71.             WRITE(*,*) 'P = ', P, ' PC = ', PC
  72.             LOGAN = .TRUE.
  73.             GOTO 9999
  74.          ENDIF
  75.          IF ((RHO .LT. 0.0D0)) THEN
  76.             WRITE(*,*) 'SUBROUTINE E_STIFF.F'
  77.             WRITE(*,*) 'ANOMALY DETECTED'
  78.             WRITE(*,*) 'RHO = ', RHO
  79.             LOGAN = .TRUE.
  80.             GOTO 9999
  81.          ENDIF
  82.       ENDIF
  83.       E = (GAMMA - 1.0D0) * RHO
  84.       E = (P + (GAMMA * PC)) / E
  85.  9999 RETURN
  86.       END
  87.  
  88.  

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