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[ICEM] Is it possible to combine "pre-mesh" and "mesh" in the same output file?

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Old   February 4, 2016, 05:36
Default Is it possible to combine "pre-mesh" and "mesh" in the same output file?
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Hakon Line
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Hi everyone! I'm a very new user to ICEM CFD, so I'm afraid the question I'm about to ask might be a very simple and obvious one. I haven't been able to figure it out from the tutorials, though, so I thought I'd post it here:

I'm simulating a liquid jet impinging on a moving wall, and my flow domain is therefore in the shape of a circular cylinder with the impingement point at bottom center.

I'd like to mesh the larger part of my domain with an O-grid, and let only the very center have an unstructured (pave type) appearance, in order to avoid the center singularity. My solution has proven extremely sensitive to skewness in this inner region, so a structured mesh doesn't give me the cell quality I need here.

I find that the pre-mesh generated by the ICEM blocking is perfect for the outer region, while the unstructured one generated from the "mesh" tab looks great for the inner region.

My question is therefore whether there's a convenient way to have the "proper" mesh only be generated in the inner region, while the "pre-mesh" takes care of the outer, and then output this to Fluent as a single msh-file?

Edit: I figured it out just after posting this, and the solution was as trivial as I expected. =P First you have to turn your blocked pre-mesh into an actual mesh by right-clicking on "Pre-Mesh" (found under "Blocking" in the tree display on the left side of the screen) and selecting "Convert to Unstruct mesh". To mesh the remaining part of the geometry, click the "Compute Mesh" button on the "Mesh" tab, and set "Input -> Select Geometry" to "Part by Part" or "From Screen" to tell the automated mesh generator to only mesh that part.
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Last edited by HakonL; February 5, 2016 at 08:33. Reason: Found the answer to the problem
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blocking, icem, pre-mesh

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