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Forum: OpenFOAM Programming & Development

November 5, 2009, 14:16

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

Hi, I'm very sorry for late reply (too much...

Hi, I'm very sorry for late reply (too much work).
Anyway, if this answer is still needed:

when we update velocity (phi = velocity*density*area) in diffusion pressure equation, we mean that dU ~...

Forum: OpenFOAM Programming & Development

October 5, 2009, 14:06

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

Buoyancy in OpenFOAM

Hi, nishant_hull (http://www.cfd-online.com/Forums/members/nishant_hull.html)

I'm also sorry for late reply - too much current work ;)

I don't know, why are you trying to write your own solver...

Forum: OpenFOAM Programming & Development

September 23, 2009, 16:15

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

Well, you are wrong about thinking way the...

Well, you are wrong about thinking way the pressure is updated in OpenFOAM

rho = psi * p, for ideal gas psi = d(rho)/d(p) = 1/(RT)

I think, you need to define constant pressure level (like it...

Forum: OpenFOAM Programming & Development

September 12, 2009, 05:31

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

Yes, it is alright. This due to difference...

Yes, it is alright.

This due to difference between OF1.4 and OF1.5

Forum: OpenFOAM Programming & Development

September 11, 2009, 02:22

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

as a rule in many OpenFOAM compressible solvers...

as a rule in many OpenFOAM compressible solvers accepted that density and pressure relates linearly: rho = psi * p. But for sonicLiquidFoam pressure and density relates as rho = rho0 + psi*p.
...

Forum: OpenFOAM Programming & Development

September 10, 2009, 16:24

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

well, phi is defined, but it needs to be...

well,

phi is defined, but it needs to be updated.

when we write

phi = (fvc::interpolate(rho * U) & mesh.Sf) + fvc::ddtPhiCorr(...) we update mass flux before solving pressure equation. This...

Forum: OpenFOAM Programming & Development

September 10, 2009, 12:07

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

In attached file you will find corrected lines,...

In attached file you will find corrected lines, marked with red color

Forum: OpenFOAM Programming & Development

September 10, 2009, 12:00

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

hi, nishant_hull i found one wrong line in...

hi, nishant_hull

i found one wrong line in your code:

phi = pEqn.flux().

for diffusive equation (where fvc::div(phi)), i think, that phi should be corrected in a such way:

phi +=...

Forum: OpenFOAM Programming & Development

September 9, 2009, 14:36

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

Yes, you are right (at most). First...

Yes, you are right (at most).

First implementation (convective-diffusive) for flows with Ma >= 0.2-0.3

Second implementation (diffusive) for flows with Ma < 0.2-0.3

Forum: OpenFOAM Programming & Development

September 7, 2009, 14:33

Replies: 22

Different Implementation in solving pEqn

Views: 7,015

Posted By mkraposhin

it's a convective-diffusive implicit form of...

it's a
convective-diffusive implicit form of pressure equation.
rho = rhoOld + rho'
because rho = psi*p -> rho = rho'
ddt(rho) + div(rho*U) = ddt(rho') + div(rho' * U) + div(rho/A*grad(p))
...

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