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Dual time stepping in unsteady pitching airfoil

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Old   March 7, 2018, 15:44
Default Dual time stepping in unsteady pitching airfoil
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mike
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dual time stepping in pitching airfoil simulation
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fluidmechanics
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Dear All;

I am trying to simulate deep dynamic stall over a pitching Naca 0012 at subsonic using SU2 V6 binary files. Same as SU2 unsteady cfg test case files, dual time stepping 2nd order is selected for unsteady simulation considering 25 points in a cycle with 1500 internal iteration. Two problems exist: First: Although 25 point per an oscillating period seems desirable and less expensive (fast simulation), but the amount of high internal iterations remove that benefit. Considering less internal iterations causes divergence. Second: due to little points per oscillation (25 or 36), some important features of stalled flow and vortex behavior are not captured.
I have done similar study (deep dynamic stall) using implicit time discretization of fixed time step using a commercial solver with more grid points and less cpu time using the same system config.
Is it possible to perform unsteady dynamic mesh simulation with implicit fixed time step in SU2? Or any other recommendation?
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Old   March 18, 2018, 22:19
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Francisco Palacios
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Not very sure about what do you mean by "implicit fixed time step" could you please provide a description (article or something). As you know, DUAL_TIME_STEPPING-1ST_ORDER or DUAL_TIME_STEPPING-2ND_ORDER use a fixed time step (not adaptive) and both methods are implicit method. The other possibility is TIME_STEPPING there the minimum Delta T in the entire domain fix the time step

Best,
Francisco
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