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Cylinder Vortex Shedding URANS

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Old   January 25, 2024, 15:29
Default Cylinder Vortex Shedding URANS
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I'm using the SST k-omega turbulence model to simulate some cylinders in crossflow in a rectangular channel. Disregarding the wall effects and the cylinder-to-cylinder interaction, I should see a shedding frequency of approximately 3kHz at the current Reynolds number (1e5). I'm just using a pressure inlet and outlet. First, I run the steady solver until there is convergence. Then, I run the 1st order unsteady solver with an adequate timestep (10 times smaller than the theoretical shedding period). The problem is that I cannot trigger the shedding, and even with a different solution initialization, the oscillations seem to dampen out. The unsteady solution in time looks just like the steady one. Based on the previous posts on this forum I understand it will be difficult to replicate the expected frequency, but at least I should be able to see it. Do you have any recommendations on how I can tweak the model to sustain the vortex street? I'm attaching some screenshots and the fluent settings summary. Thank you!
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File Type: png mesh.png (111.3 KB, 2 views)
File Type: png velocity_contour.png (139.3 KB, 3 views)
File Type: jpg domain.jpg (29.9 KB, 1 views)
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File Type: txt fluent_settings_summary.txt (12.2 KB, 0 views)

Last edited by toni_rt; January 25, 2024 at 16:08. Reason: uploaded supporting screenshots
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fluent, k-omega sst, urans, vortex shredding

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