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Re-initialize everything during run-time without restarting simulation

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Old   December 2, 2021, 19:15
Default Re-initialize everything during run-time without restarting simulation
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Nadun Palmada
Join Date: Apr 2017
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Hi

I am currently running moving mesh simulations using OpenFOAM 5.x on pimpleDyMFoam, and I am wanting to run an initial timestep (say 0.1) where I deform the mesh to a newer mesh but reset the flow (back to initial conditions) at 0.1s and continue simulation.

The reason why I need to do this is because I found that by starting the mesh at a highly deformed state I can spring the mesh back to an undeformed state and further deform to a highly deformed state along the simulation (slightly more deformed that the initial) without the mesh breaking. I have run the moveDynamicMesh application through the entire simulation without the mesh breaking. But if I start at the resting or undeformed state then the mesh breaks.

I tried adjusting the pimpleDyMFoam application such that the code after mesh.update();

Code:
phi = mesh.Sf() & Uf;

            if (mesh.changing() && correctPhi)
            {
                #include "correctPhi.H"
            }

            // Make the flux relative to the mesh motion
            fvc::makeRelative(phi, U);

            if (mesh.changing() && checkMeshCourantNo)
            {
                #include "meshCourantNo.H"
            }
            // --- Pressure-velocity PIMPLE corrector loop
            while (pimple.loop())
            {
                #include "UEqn.H"

                // --- Pressure corrector loop
                while (pimple.correct())
                {
                    #include "pEqn.H"
                }

                if (pimple.turbCorr())
                {
                    laminarTransport.correct();
                    turbulence->correct();
                }
            }
only runs after runTime.value() >= 0.2 , but this still resulted in extremely high velocities at the walls. I have also tried using manipulatePatchField and manipulateField swakFunctionObjects to adjust the field during run-time but this didn't seem to work.

Thanks
Nadun
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moving mesh., pimple transient

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