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reactingEulerFoam, twoPhaseEulerFoam: Reinstated interfacial pressure-work

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Added the interfacial pressure-work terms according to:

Ishii, M., Hibiki, T.,
Thermo-fluid dynamics of two-phase flow,
ISBN-10: 0-387-28321-8, 2006

While this is the most common approach to handling the interfacial
pressure-work it introduces numerical stability issues in regions of low
phase-fraction and rapid flow deformation.  To alleviate this problem an
optional limiter may be applied to the pressure-work term in either of
the energy forms.  This may specified in the
"thermophysicalProperties.<phase>" file, e.g.

pressureWorkAlphaLimit 1e-3;

which sets the pressure work term to 0 for phase-fractions below 1e-3.

For particularly unstable cases a limit of 1e-2 may be necessary.
This commit is contained in:
Henry Weller
2016-11-09 11:14:26 +00:00
parent 5e69858283
commit ad476af9b3
2 changed files with 6 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
applications/solvers/multiphase/reactingEulerFoam/phaseSystems/phaseModel/AnisothermalPhaseModel/AnisothermalPhaseModel.C
View File

@ -144,15 +144,12 @@ Foam::AnisothermalPhaseModel<BasePhaseModel>::heEqn()
tEEqn.ref() += filterPressureWork tEEqn.ref() += filterPressureWork
( (
fvc::div(fvc::absolute(alphaPhi, alpha, U), this->thermo().p()) fvc::div(fvc::absolute(alphaPhi, alpha, U), this->thermo().p())
+ this->thermo().p()*fvc::ddt(alpha)
); );
} }
else if (this->thermo_->dpdt()) else if (this->thermo_->dpdt())
{ {
tEEqn.ref() -= filterPressureWork tEEqn.ref() -= filterPressureWork(alpha*this->fluid().dpdt());
(
fvc::ddt(alpha, this->thermo().p())
+ alpha*(this->fluid().dpdt() - fvc::ddt(this->thermo().p()))
);
} }
return tEEqn; return tEEqn;

6
applications/solvers/multiphase/twoPhaseEulerFoam/EEqns.H
View File

@ -16,7 +16,8 @@
- contErr1*K1 - contErr1*K1
+ ( + (
he1.name() == thermo1.phasePropertyName("e") he1.name() == thermo1.phasePropertyName("e")
? fvc::ddt(alpha1)*p + fvc::div(alphaPhi1, p) ? fvc::div(fvc::absolute(alphaPhi1, alpha1, U1), p)
+ p*fvc::ddt(alpha1)
: -alpha1*dpdt : -alpha1*dpdt
) )
@ -48,7 +49,8 @@
- contErr2*K2 - contErr2*K2
+ ( + (
he2.name() == thermo2.phasePropertyName("e") he2.name() == thermo2.phasePropertyName("e")
? fvc::ddt(alpha2)*p + fvc::div(alphaPhi2, p) ? fvc::div(fvc::absolute(alphaPhi2, alpha2, U2), p)
+ p*fvc::ddt(alpha1)
: -alpha2*dpdt : -alpha2*dpdt
) )