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How to remove spurious oscillations for shear stress? |
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January 11, 2021, 19:29 |
How to remove spurious oscillations for shear stress?
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#1 |
Member
Join Date: Feb 2019
Posts: 69
Rep Power: 7 |
Using RANS model for backstep and all is good except the anisotropic component of the shear stress where there is a lot of oscillation at the region of flow separation. I can't remove them even at high mesh density. Any recommendation to remove them?
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January 12, 2021, 16:11 |
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#2 |
Senior Member
Kira
Join Date: Nov 2020
Location: Canada
Posts: 435
Rep Power: 8 |
Hello,
I am not sure if mesh density is the issue here. To reduce spurious oscillations, damping factors can be implemented mainly in implicit time integration schemes. The bulk viscosity method (BVM) is an explicit scheme for damping spurious oscillation, used in commercial types of software such as LS-DYNA and ABAQUS. Here is a link to a paper (it's open access) with more information: https://www.sciencedirect.com/scienc...98122115003089 |
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January 13, 2021, 02:47 |
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#3 | |
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Posts: 69
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Quote:
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backstep flow, instability, oscillations |
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