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Bugfix: mesh flux using backward scheme with variable time step

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The coefficients in backwardDdtScheme::meshPhi did not correctly take into
account the possibility of having variable time steps.

Reported by Sopheak Seng, Bureau Veritas.
This commit is contained in:
Vuko Vukcevic 2018-09-07 14:56:55 +02:00
parent bb6facbfbf
commit d5b37a2d37
1 changed files with 7 additions and 8 deletions
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15
src/finiteVolume/finiteVolume/ddtSchemes/backwardDdtScheme/backwardDdtScheme.C
View file

@ -801,16 +801,15 @@ tmp<surfaceScalarField> backwardDdtScheme<Type>::meshPhi
const GeometricField<Type, fvPatchField, volMesh>& vf
)
{
scalar deltaT = deltaT_();
scalar deltaT0 = deltaT0_(vf);
const scalar deltaT = deltaT_();
const scalar deltaT0 = deltaT0_(vf);
// Coefficient for t-3/2 (between times 0 and 00)
scalar coefft0_00 = deltaT/(deltaT + deltaT0);
// Bugfix: missing possibility of having the variable time step
// Reported by Sopheak Seng, Bureau Veritas, 6/Sep/2018.
const scalar coefft00 = deltaT*deltaT/(deltaT0*(deltaT + deltaT0));
const scalar coefft = 1 + deltaT/(deltaT + deltaT0);
// Coefficient for t-1/2 (between times n and 0)
scalar coefftn_0 = 1 + coefft0_00;
return coefftn_0*mesh().phi() - coefft0_00*mesh().phi().oldTime();
return coefft*mesh().phi() - coefft00*mesh().phi().oldTime();
}