|  | programmer's documentation | 
This function adds the explicit part of the diffusion terms with a symmetric tensor diffusivity for a transport equation of a scalar field  .  
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| Functions/Subroutines | |
| subroutine | diften (idtvar, ivar, nswrgp, imligp, ircflp, inc, imrgra, iccocg, ipp, iwarnp, epsrgp, climgp, extrap, relaxp, thetap, pvar, pvara, coefap, coefbp, cofafp, cofbfp, viscf, viscb, viscel, weighf, weighb, smbrp) | 
This function adds the explicit part of the diffusion terms with a symmetric tensor diffusivity for a transport equation of a scalar field  .
. 
More precisely, the right hand side  is updated as follows:
 is updated as follows: 
![\[ Rhs = Rhs - \sum_{\fij \in \Facei{\celli}} \left( - \tens{\mu}_\fij \gradv_\fij \varia \cdot \vect{S}_\ij \right) \]](form_16.png) 
Warning:
 has already been initialized before calling diften!
 has already been initialized before calling diften!| subroutine diften | ( | integer | idtvar, | 
| integer | ivar, | ||
| integer | nswrgp, | ||
| integer | imligp, | ||
| integer | ircflp, | ||
| integer | inc, | ||
| integer | imrgra, | ||
| integer | iccocg, | ||
| integer | ipp, | ||
| integer | iwarnp, | ||
| double precision | epsrgp, | ||
| double precision | climgp, | ||
| double precision | extrap, | ||
| double precision | relaxp, | ||
| double precision | thetap, | ||
| double precision, dimension (ncelet) | pvar, | ||
| double precision, dimension(ncelet) | pvara, | ||
| double precision, dimension(nfabor) | coefap, | ||
| double precision, dimension(nfabor) | coefbp, | ||
| double precision, dimension(nfabor) | cofafp, | ||
| double precision, dimension(nfabor) | cofbfp, | ||
| double precision, dimension (nfac) | viscf, | ||
| double precision, dimension (nfabor) | viscb, | ||
| double precision, dimension(6,ncelet), target | viscel, | ||
| double precision, dimension(2,nfac) | weighf, | ||
| double precision, dimension(nfabor) | weighb, | ||
| double precision, dimension (ncelet) | smbrp | ||
| ) | 
| [in] | idtvar | indicator of the temporal scheme | 
| [in] | ivar | index of the current variable | 
| [in] | nswrgp | number of reconstruction sweeps for the gradients | 
| [in] | imligp | clipping gradient method 
 | 
| [in] | ircflp | indicator 
 | 
| [in] | inc | indicator 
 | 
| [in] | imrgra | indicator 
 | 
| [in] | iccocg | indicator 
 | 
| [in] | ipp | index of the variable for post-processing | 
| [in] | iwarnp | verbosity | 
| [in] | epsrgp | relative precision for the gradient reconstruction | 
| [in] | climgp | clipping coeffecient for the computation of the gradient | 
| [in] | extrap | coefficient for extrapolation of the gradient | 
| [in] | relaxp | coefficient of relaxation | 
| [in] | thetap | weightening coefficient for the theta-schema, 
 | 
| [in] | pvar | solved variable (current time step) | 
| [in] | pvara | solved variable (previous time step) | 
| [in] | coefap | boundary condition array for the variable (Explicit part) | 
| [in] | coefbp | boundary condition array for the variable (Impplicit part) | 
| [in] | cofafp | boundary condition array for the diffusion of the variable (Explicit part) | 
| [in] | cofbfp | boundary condition array for the diffusion of the variable (Implicit part) | 
| [in] | viscf |  at interior faces for the r.h.s. | 
| [in] | viscb |  at border faces for the r.h.s. | 
| [in] | viscel | symmetric cell tensor   | 
| [in] | weighf | internal face weight between cells i j in case of tensor diffusion | 
| [in] | weighb | boundary face weight for cells i in case of tensor diffusion | 
| [in,out] | smbrp | right hand side   | 
 1.8.3.1
 1.8.3.1