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February 28, 2014, 12:55 |
A question on interDyMFoam
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#1 |
Senior Member
Gerhard Holzinger
Join Date: Feb 2012
Location: Austria
Posts: 339
Rep Power: 28 |
I have a question to the following piece of code taken from interDyMFoam.C of OpenFOAM-2.2.x.
In the curly braces the variable Urel is declared and used inside the if-statement. Where is Urel used in this solver? It is neither passed to any method as an argument nor should it be accessible outside the block within the curly braces. So, of what use is Urel? Code:
scalar timeBeforeMeshUpdate = runTime.elapsedCpuTime(); { // Calculate the relative velocity used to map the relative flux phi volVectorField Urel("Urel", U); if (mesh.moving()) { Urel -= fvc::reconstruct(fvc::meshPhi(U)); } // Do any mesh changes mesh.update(); } if (mesh.changing()) { |
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February 28, 2014, 14:28 |
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#2 |
Senior Member
Sandeep Menon
Join Date: Mar 2009
Location: Amherst, MA
Posts: 403
Rep Power: 25 |
As the comment suggests, a relative flux field is calculated internally by dynamicRefineFvMesh for mapping purposes.
When the mesh changes, all fields in the registry (including the Urel field) are mapped auto-magically. |
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March 1, 2014, 04:34 |
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#3 |
Senior Member
Gerhard Holzinger
Join Date: Feb 2012
Location: Austria
Posts: 339
Rep Power: 28 |
Hi, thanks for the answer.
What is still not clear to me is, where Urel is used. As it is declared within this block I assume it is not in use before this block. To me it seems that Urel is nowhere used, but probably I am just confused. |
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March 4, 2015, 13:39 |
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#4 |
Senior Member
Chris Sideroff
Join Date: Mar 2009
Location: Ottawa, ON, CAN
Posts: 434
Rep Power: 22 |
It's created simply for recomputing the fluxes on the newly refined mesh. In the dynamicMeshDict, under the correctFluxes entry you'll find a list of pairs. Those are mappings of the velocity fields to the fluxes. Since the flux phi is relative to mesh motion, it needs a relative velocity mapped to it. Since a relative velocity isn't stored anywhere else, it's computed where you point out. That's all Urel is used for.
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