Commit 7f3580eb authored by Dennis Gläser's avatar Dennis Gläser Committed by Timo Koch
Browse files

[mpfa][fluxcaching] use constant zero threshold for diffcoeffs

parent 1fbc7f43
......@@ -194,6 +194,7 @@ class PorousMediumFluxVariablesCacheFillerImplementation<TypeTag, Discretization
using Problem = GetPropType<TypeTag, Properties::Problem>;
using GridView = typename GetPropType<TypeTag, Properties::GridGeometry>::GridView;
using Element = typename GridView::template Codim<0>::Entity;
using Scalar = GetPropType<TypeTag, Properties::Scalar>;
using GridGeometry = GetPropType<TypeTag, Properties::GridGeometry>;
using FVElementGeometry = typename GridGeometry::LocalView;
......@@ -624,22 +625,23 @@ private:
return volVars.effectiveDiffusionCoefficient(phaseIdx, FluidSystem::getMainComponent(phaseIdx), compIdx);
// Effective diffusion coefficients might get zero if saturation = 0.
// Effective diffusion coefficients might be zero if saturation = 0.
// Compute epsilon to detect obsolete rows in the iv-local matrices during assembly
const auto& scv = *scvs(fvGeometry()).begin();
const auto& scvf = *scvfs(fvGeometry()).begin();
static const auto zeroD = getParamFromGroup<Scalar>(
// compute a representative transmissibility for this interaction volume, using
// the threshold for zero diffusion coefficients, and use this as epsilon
const auto& scv = fvGeometry().scv(iv.localScv(0).gridScvIndex());
const auto& scvf = fvGeometry().scvf(iv.localScvf(0).gridScvfIndex());
const auto& vv = elemVolVars()[scv];
const auto D = [&] ()
// diffusion coefficients below 1e-20 are treated as zeroes!!
using std::max;
if constexpr (!FluidSystem::isTracerFluidSystem())
return max(1e-20, vv.diffusionCoefficient(phaseIdx, FluidSystem::getMainComponent(phaseIdx), compIdx));
return max(1e-20, vv.diffusionCoefficient(0, 0, compIdx));
} ();
const auto eps = Extrusion::area(scvf)*computeTpfaTransmissibility(
scvf, scv, zeroD, vv.extrusionFactor()
auto eps = 1e-7*computeTpfaTransmissibility(scvf, scv, D, vv.extrusionFactor())*Extrusion::area(scvf);
localAssembler.assembleMatrices(handle.diffusionHandle(), iv, getD, eps);
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