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Commit 911f50ce authored by henry's avatar henry
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XiFoam: Added relaxation statements to Su and Xi equations

This makes the solver more robust when the "Courant number" of the flame
propagation fluctuates.
parent 08916e83
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......@@ -30,7 +30,7 @@ if (ign.ignited())
n /= mgb;
# include "StCorr.H"
#include "StCorr.H"
// Calculate turbulent flame speed flux
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
......@@ -58,7 +58,7 @@ if (ign.ignited())
// Add ignition cell contribution to b-equation
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# include "ignite.H"
#include "ignite.H"
// Solve for b
......@@ -134,7 +134,7 @@ if (ign.ignited())
(sigmas*SuInf*(Su0 - SuInf) + sqr(SuMin)*sigmaExt)
/(sqr(Su0 - SuInf) + sqr(SuMin));
solve
fvScalarMatrix SuEqn
(
fvm::ddt(rho, Su)
+ fvm::div(phi + phiXi, Su, "div(phiXi,Su)")
......@@ -144,6 +144,9 @@ if (ign.ignited())
- fvm::SuSp(rho*(sigmas + Rc), Su)
);
SuEqn.relax();
SuEqn.solve();
// Limit the maximum Su
// ~~~~~~~~~~~~~~~~~~~~
Su.min(SuMax);
......@@ -196,7 +199,7 @@ if (ign.ignited())
// Solve for the flame wrinkling
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
solve
fvScalarMatrix XiEqn
(
fvm::ddt(rho, Xi)
+ fvm::div(phi + phiXi, Xi, "div(phiXi,Xi)")
......@@ -215,6 +218,8 @@ if (ign.ignited())
)
);
XiEqn.relax();
XiEqn.solve();
// Correct boundedness of Xi
// ~~~~~~~~~~~~~~~~~~~~~~~~~
......
......@@ -48,5 +48,9 @@ PISO
nNonOrthogonalCorrectors 0;
}
relaxationFactors
{
"(Xi|Su)" 1;
}
// ************************************************************************* //
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