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December 1, 2020, 16:47 |
Reduce diffusion error in a wavemaker case
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#1 |
Member
Grivalszki Péter
Join Date: Mar 2019
Location: Budapest, Hungary
Posts: 39
Rep Power: 7 |
Hi Foamers,
I have a flap wavemaker simulation. From the results I can see that waves are smearing very fast, what differs from laboratory experimentents. How can I reduce this numerical diffusion error? |
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December 3, 2020, 13:50 |
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#2 |
New Member
Tamas Egeresi
Join Date: Nov 2014
Location: Budapest, Hungary
Posts: 14
Rep Power: 12 |
Hi Péter,
Try to use dynamic mesh refinement, or just play around the fvSchemes by setting less diffusive schemes.
__________________
Tamas Egeresi Senior Hydraulics Engineer CFD Egeresi www.cfdegeresi.freecluster.eu |
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December 3, 2020, 17:31 |
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#3 |
Member
Grivalszki Péter
Join Date: Mar 2019
Location: Budapest, Hungary
Posts: 39
Rep Power: 7 |
Thank you for your reply!
I thought about it and I tried, but I could not solve it. I use the esi version of OF, I use the DynamicMeshDict to define motion or refinement. I tried to figure it out, but I could not solve to define both in one case. Do you have a solution for this? (OF v2006) I also tried, mostly with vanLeer and linear schemes, "Gauss interfaceCompression vanLeer" for div(phi,alpha) but no success. Any hint? Anyway, I use k-Omega SST turbulence model with buoyancy correction by Larsen and Devolder (multiphaseStabilizedTurbulence)... |
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December 4, 2020, 03:06 |
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#4 |
New Member
Tamas Egeresi
Join Date: Nov 2014
Location: Budapest, Hungary
Posts: 14
Rep Power: 12 |
Hi!
Can you, please, upload a simple case to let me play with the setup?
__________________
Tamas Egeresi Senior Hydraulics Engineer CFD Egeresi www.cfdegeresi.freecluster.eu |
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December 4, 2020, 05:02 |
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#5 |
Member
Grivalszki Péter
Join Date: Mar 2019
Location: Budapest, Hungary
Posts: 39
Rep Power: 7 |
Thank you, I'll send it with weTransfer link in e-mail through your website
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Tags |
diffusion error, flume, numerical diffusion, smearing, wavemaker |
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