Is the faceMask object in pEqn.h part of the dynamic mesh update?

massive_turbulence · January 30, 2019, 09:27

Hello all,

I'm trying to find the reason for why "faceMask" is used in this piece of code?

Code:

surfaceScalarField faceMask(localMin<scalar>(mesh).interpolate(cellMask));

volScalarField rAU(1.0/UEqn.A());
surfaceScalarField rhorAUf("rhorAUf", faceMask*fvc::interpolate(rho*rAU));
volVectorField HbyA("HbyA", U);
HbyA = constrainHbyA(cellMask*rAU*UEqn.H(), U, p);

I'm guessing it's part of calculating boundaries for the moving mesh?

https://www.openfoam.com/documentati...8H_source.html

Here some more info from https://fossies.org/linux/OpenFOAM/s...eateCellMask.H

Code:

  34 Info<< "Creating cellMask field to block out hole cells\n" << endl;
   35 
   36 volScalarField cellMask
   37 (
   38     IOobject
   39     (
   40         "cellMask",
   41         runTime.timeName(),
   42         mesh,
   43         IOobject::NO_READ,
   44         IOobject::NO_WRITE
   45     ),
   46     mesh,
   47     dimensionedScalar("one", dimless, 1.0),
   48     zeroGradientFvPatchScalarField::typeName
   49 );
   50 
   51 #include "setCellMask.H"
   52 
   53 // *************************************************************************

What are hole cells?

massive_turbulence · February 1, 2019, 14:58

I think I found what hole cells are.

" Holecutting boundaries are typically defined by solid wall boundary conditions".

from: "A High-Order Overset Method on Moving and Deforming Grids" by Jacob Crabill and Antony Jameson. http://aero-comlab.stanford.edu/Pape...r2016-3225.pdf

Basically if you have an object that's the negative space and it's a moving mesh, that's the hole cell.

master.img-000.jpg

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February 1, 2019, 14:58		#2
massive_turbulence Senior Member Andrew Somorjai Join Date: May 2013 Posts: 175 Rep Power: 13	I think I found what hole cells are. " Holecutting boundaries are typically defined by solid wall boundary conditions". from: "A High-Order Overset Method on Moving and Deforming Grids" by Jacob Crabill and Antony Jameson. http://aero-comlab.stanford.edu/Pape...r2016-3225.pdf Basically if you have an object that's the negative space and it's a moving mesh, that's the hole cell. master.img-000.jpg