Advection relaxation routine for the D3Q19 model with TRT collision operator In TRT, there are two relaxation parameters one can choose. They have a relationship, which is so-called magic number: Lambda = ( 1/omegaP - 1/2 ) * ( 1/omegaN - 1/2 ) Different value of Lambda results different error: Lambda = 1/4 is the best stability for the LBE. As well, this number gives the solution for the steady-state case dependant only on the equilibirium funciton. Lambda = 1/12 removes the third-order advection error Lambda = 1/6 removes fourth-order diffusion errors Lambda = 3/16 gives exact location of bounce-back walls for the Poiseuille flow. omegaP is usually fixed by viscosity, another one is fixed through the above magic number combination.
This subroutine interface must match the abstract interface definition kernel in scheme/mus_scheme_type_module.f90 in order to be callable via compute function pointer.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| type(mus_field_prop_type), | intent(in) | :: | fieldProp(:) |
Array of field properties (fluid or species) |
||
| real(kind=rk), | intent(in) | :: | inState(nElems*varSys%nScalars) |
input pdf vector |
||
| real(kind=rk), | intent(out) | :: | outState(nElems*varSys%nScalars) |
output pdf vector |
||
| real(kind=rk), | intent(inout) | :: | auxField(nElems*varSys%nAuxScalars) |
Auxiliary field computed from pre-collision state Is updated with correct velocity field for multicomponent models |
||
| integer, | intent(in) | :: | neigh(nElems*layout%fStencil%QQ) |
connectivity vector |
||
| integer, | intent(in) | :: | nElems |
number of elements in state Array |
||
| integer, | intent(in) | :: | nSolve |
number of elements solved in kernel |
||
| integer, | intent(in) | :: | level |
current level |
||
| type(mus_scheme_layout_type), | intent(in) | :: | layout |
current layout |
||
| type(mus_param_type), | intent(in) | :: | params |
global parameters |
||
| type(tem_varSys_type), | intent(in) | :: | varSys |
variable system definition |
||
| type(mus_derVarPos_type), | intent(in) | :: | derVarPos(:) |
position of derived quantities in varsys for all fields |