public pure function convPrePost(omega) result(conv)
Conversion factor betwen the pre- and post-collision quantity for the shear
stress.

Shear stress calculation requires the non-equilibirium value of pdf before
collision. However that value not may be accessable directly when PULL
scheme is uitilized, as only pdf after collision is available.
So this conversion factor is introduced to help
recover fNeq before collision from fNeq after collision as long as
relaxation parameter (omage) does not equal to 1.0. When omage equals to 1,
this conversion factor is set to be 0.

How to use this pre-factor?

```
shearstress = convPrePost(omega) * omega * cs2inv * shearLB_postColl
```

Arguments
Type Intent Optional Attributes Name
real(kind=rk),
intent(in)
::
omega

Return Value real(kind=rk)

Called by
proc~~convprepost~~CalledByGraph
proc~convprepost
convPrePost
proc~getneq_diffusive
getNEq_diffusive
proc~getneq_diffusive->proc~convprepost
proc~mus_deriveelectricfield
mus_deriveElectricField
proc~mus_deriveelectricfield->proc~convprepost
proc~getshearstresstensorincomp_forpdfsubset
getShearStressTensorIncomp_forPdfSubset
proc~getshearstresstensorincomp_forpdfsubset->proc~convprepost
proc~getshearstresstensor_forelemfromstate
getShearStressTensor_forElemFromState
proc~getshearstresstensor_forelemfromstate->proc~convprepost
proc~getshearratetensor_acoustic_lbm
getShearRateTensor_acoustic_lbm
proc~getshearratetensor_acoustic_lbm->proc~convprepost
proc~getneq_acoustic
getNEq_acoustic
proc~getneq_acoustic->proc~convprepost
proc~getshearratetensor_acoustic_incomp
getShearRateTensor_acoustic_incomp
proc~getshearratetensor_acoustic_incomp->proc~convprepost
proc~getshearstresstensor_forpdfsubset
getShearStressTensor_forPdfSubset
proc~getshearstresstensor_forpdfsubset->proc~convprepost
proc~setthirdorder_diffusive
setThirdOrder_diffusive
proc~setthirdorder_diffusive->proc~convprepost
proc~getshearratetensor_diffusive_forpdfsubset
getShearRateTensor_diffusive_forPdfSubset
proc~getshearratetensor_diffusive_forpdfsubset->proc~convprepost
proc~set_pdfdiffusive
set_pdfDiffusive
proc~set_pdfdiffusive->proc~getneq_diffusive
proc~set_pdfacoustic
set_pdfAcoustic
proc~set_pdfacoustic->proc~getneq_acoustic
interface~getshearratetensor_acoustic
getShearRateTensor_acoustic
interface~getshearratetensor_acoustic->proc~getshearratetensor_acoustic_lbm
interface~getshearratetensor_acoustic->proc~getshearratetensor_acoustic_incomp
proc~mus_init_pdf
mus_init_pdf
proc~mus_init_pdf->proc~getneq_diffusive
proc~mus_init_pdf->proc~getneq_acoustic
interface~getshearratetensor_diffusive
getShearRateTensor_diffusive
interface~getshearratetensor_diffusive->proc~getshearratetensor_diffusive_forpdfsubset
interface~getshearstresstensor
getShearStressTensor
interface~getshearstresstensor->proc~getshearstresstensorincomp_forpdfsubset
interface~getshearstresstensor->proc~getshearstresstensor_forelemfromstate
interface~getshearstresstensor->proc~getshearstresstensor_forpdfsubset
proc~fillmyghostsfromfiner_tgv3d
fillMyGhostsFromFiner_TGV3D
proc~fillmyghostsfromfiner_tgv3d->proc~set_pdfdiffusive
proc~getwss
getWSS
proc~getwss->interface~getshearstresstensor
proc~fillfinerghostsfromme_tgv3d
fillFinerGhostsFromMe_TGV3D
proc~fillfinerghostsfromme_tgv3d->proc~set_pdfdiffusive
proc~getwss2d
getWSS2D
proc~getwss2d->interface~getshearstresstensor
proc~fillfinerghostsfromme_tgv2d
fillFinerGhostsFromMe_TGV2D
proc~fillfinerghostsfromme_tgv2d->proc~set_pdfdiffusive
proc~fillmyghostsfromfiner_tgv2d
fillMyGhostsFromFiner_TGV2D
proc~fillmyghostsfromfiner_tgv2d->proc~set_pdfdiffusive
proc~mus_init_byic
mus_init_byIC
proc~mus_init_byic->proc~mus_init_pdf
proc~mus_init_flow
mus_init_flow
proc~mus_init_flow->proc~mus_init_byic
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