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[Other] Increasing interface resolution with adaptive meshing

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Old   May 2, 2017, 08:38
Default Increasing interface resolution with adaptive meshing
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Laura Luhede
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Hi all,

we want to analyse the shear stress at an oil-water interface. For that we use the VOF method coupled with level set. The first validation case showed large gradients at the interface and we need to increase the resolution in the interface area, to get the right shear stress results.
Our approach is to add the dynamic mesh refinement to aour solver. The problem is, that here, while refining the area, the resolution stays constant as the interface layer is reduced, so even with mesh refinement we get the same number of data points (see images of oil drop in water).

Does anyone have an idea how to increase the data points in the interface area?
Second issue is, that the initialization seems to be wrong as we get a SLIC like surface reconstruction instead of PLIC. Does anyone know a reason for that?

What we tried so far:
- Mesh refinement without level set, thin interface still apeared (interDyMFoam / Problem 1)
- Surface reconstruction over time due to interfacial tension, but no perfect sphere reached (Problem 2)

It would be great if someone could give us a hint how to proceed.

Best regards,
Laura
Attached Images
File Type: jpg without_dynamic_mesh.jpg (84.9 KB, 16 views)
File Type: jpg with_dynamic_mesh.jpg (85.6 KB, 16 views)
File Type: jpg dynamicMesh_afterEquilibrationTime.jpg (95.6 KB, 18 views)
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Old   May 9, 2017, 11:40
Default This website should help you
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Phanindra
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http://www.holzmann-cfd.de/index.php...efinefvmesh-en
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