RFLO_ModVectorTensor.F90

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! ******************************************************************************
!
! Purpose: Suite for vector and tensor/matrix operations
!
! Description: None.
!
! Notes: None.
!
! ******************************************************************************
!
! $Id: RFLO_ModVectorTensor.F90,v 1.3 2008/12/06 08:44:17 mtcampbe Exp $
!
! Copyright: (c) 2004 by the University of Illinois
!
! ******************************************************************************

MODULE rflo_modvectortensor

  USE modglobal, ONLY    : t_global 
  USE moddatastruct, ONLY: t_region  
  USE modgrid, ONLY      : t_grid
  USE modbndpatch, ONLY  : t_patch
  USE modparameters
  USE moddatatypes
  USE moderror
  USE modmpi
  
  IMPLICIT NONE

  PRIVATE
  PUBLIC :: rflo_normcrossprod

! private :
    
! ******************************************************************************
! Declarations and definitions
! ******************************************************************************  
   
  CHARACTER(CHRLEN) :: RCSIdentString = & 
    '$RCSfile: RFLO_ModVectorTensor.F90,v $ $Revision: 1.3 $'        
             
! ******************************************************************************
! Routines
! ******************************************************************************

  CONTAINS

!******************************************************************************
!
! Purpose: perform cross product and normalize it
!
! Description: none.
!
! Input: s1, s2 = pair of vectors to be processed
!
! Output: s3 = s1 x s2
!
! Notes: none
!
!******************************************************************************

SUBROUTINE rflo_normcrossprod( s1,s2,s3 )

  IMPLICIT NONE

! ... parameters
  REAL(RFREAL) :: s1(:), s2(:), s3(:)

! ... loop variables

! ... local variables
  REAL(RFREAL) :: smag

!******************************************************************************

  s3(xcoord) = s1(ycoord)*s2(zcoord)-s1(zcoord)*s2(ycoord)
  s3(ycoord) = s1(zcoord)*s2(xcoord)-s1(xcoord)*s2(zcoord)
  s3(zcoord) = s1(xcoord)*s2(ycoord)-s1(ycoord)*s2(xcoord)
  smag       = sqrt( s3(xcoord)**2+s3(ycoord)**2+s3(zcoord)**2 )
  s3(:)      = s3(:)/smag

END SUBROUTINE rflo_normcrossprod

! ******************************************************************************
! End
! ******************************************************************************

END MODULE rflo_modvectortensor

! ******************************************************************************
!
! RCS Revision history:
!
! $Log: RFLO_ModVectorTensor.F90,v $
! Revision 1.3  2008/12/06 08:44:17  mtcampbe
! Updated license.
!
! Revision 1.2  2008/11/19 22:17:28  mtcampbe
! Added Illinois Open Source License/Copyright
!
! Revision 1.1  2005/12/05 10:53:09  wasistho
! initial import
!
!
!
! ******************************************************************************