UEqn without pressure term
I have a momentum transport equation which is not pressure-driven, in addition to the continuity equation. Instead it has gravity and drag terms as the driving force.
I can include it into OpenFOAM as:
div(phi,U) == gravity + drag
However, I can not include the continuity equation with this one. The solver does not compile when I try
fvm::div(phi) or fvc::div(phi)
I know that in simple algorithm, the continuity equation is included in the pressure equation. But i don't have to solve for pressure, it is not anywhere in the equations. How can I do it?
I need to include the equation shown in attachment, which is a mass conservation equation, where "a" is phase volume fraction in a multiphase flow.
I defined "a" as a volScalarField.
When I do at as:
error: no matching function for call to ‘div(Foam::volScalarField&, Foam::volVectorField&)’
I suppose, I can not use two volume fields as argument in fvm::div
Then I switch to
This time solver converges, but when I solve my case, it gives floating point exception if my internal field value for "a" is different than the voundary condition value.
try this :
I modified it as
linearInterpolate(alpha*U) & mesh.Sf()
in order to get phase flux. I am not sure if this makes sense.
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