Problem computing divergence field

gdeneyer · April 1, 2012, 07:06

Hello,

I'm actually trying to compute the divergence field for a laminar compressible flow on a cylinder and I got weird results around the cylinder. I have a zero divergence field inside the structured grid around cylinder and then some fluctuation in the non structured grid.

The code I used for this was just this at the end of my timeloop
volScalarField divField
(
IOobject
(
"divU",
mesh.time().timeName(),
mesh,
IOobject::NO_READ
IOobject::AUTO_WRITE
),
fvc::div(U)
);

Note: the flow is laminar with low Mach number 0.05 using rhoPimpleFoam, in attachment the divergence field with and without the mesh

alberto · April 2, 2012, 02:34

There are a good number of posts explaining that what should be computed is

fvc::div(phi)

and not fvc::div(U).

Best regards,

April 2, 2012, 02:34		#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	There are a good number of posts explaining that what should be computed is fvc::div(phi) and not fvc::div(U). Best regards, __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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