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fstral

  1. C FSTRAL    SOURCE    BECC      11/05/26    21:15:29     6981
  2.       SUBROUTINE FSTRAL(
  3.      &     PC, GAM,
  4.      &     P, RHO_L, P_L, U_L,
  5.      &     U, RHO, D,
  6.      &     LOGDEB, LOGAN)
  7. *
  8. *************************************************************************
  9. *
  10. * project           :  CAST3M, EUROPLEXUS...
  11. *
  12. * name              :  fstral
  13. *
  14. * description       :  euler equations for a mixture of stiffened gases
  15. *                      flux in the non-reactive case.
  16. *
  17. *                      left rarefaction curve as function of p
  18. *
  19. * language          :  fortran 77
  20. *
  21. * author            :  a. beccantini den/dm2s/sfme/ltmf
  22. *
  23. *************************************************************************
  24. *
  25. * called by         :
  26. *
  27. *
  28. *************************************************************************
  29. *
  30. ***** input
  31. *
  32. *     pc, gam         = properties of the gas
  33. *
  34. *     p               = pressure in the right side of the left
  35. *                       rarefaction
  36. *
  37. *     rho_l, p_l, u_l
  38. *                     = density, pressure, velocity on the left
  39. *
  40. *     logdeb          = debugging ?
  41. *
  42. ***** output
  43. *
  44. *     u               = velocity in the right side of the left
  45. *                       rarefaction
  46. *
  47. *     d               = rarefaction speed
  48. *
  49. *     logan           = anomaly ?
  50. *
  51. *************************************************************************
  52. *
  53. *     26/11/2009      created
  54. *     25/05/2011      evolution in CAST3M
  55. *
  56. *************************************************************************
  57. *
  58. * n.b.: all variables are declared
  59. *
  60. C      IMPLICIT NONE
  61.       IMPLICIT INTEGER(I-N)
  62.       REAL*8
  63.      &     PC, GAM,
  64.      &     P, RHO_L, P_L, U_L,
  65.      &     U, RHO, D
  66. *
  67.       REAL*8 VAR
  68. *
  69. *     debugging ?
  70. *
  71.       LOGICAL LOGDEB, LOGAN
  72. *
  73. *     a left rarefaction in the x-frame is a right rarefaction in the
  74. *     -x-frame !
  75. *
  76.       VAR = -1.0D0 * U_L
  77.       CALL FSTRAR(PC, GAM, P, RHO_L, P_L, VAR,
  78.      &     U, RHO, D, LOGDEB, LOGAN)
  79.       U = -1.0D0 * U
  80.       D = -1.0D0 * D
  81. *
  82.       IF (LOGAN) THEN
  83.          WRITE(*,*) 'SUBROUTINE FSTRAL.F'
  84.          WRITE(*,*) 'ANOMALY DETECTED.'
  85.          GOTO 9999
  86.       ENDIF
  87. *
  88.  9999 RETURN
  89.       END
  90.  
  91.  

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