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[ANSYS Meshing] Blocking and Meshing Strategy for an open flow domain over backward facing ramp

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Old   January 11, 2013, 06:48
Default Blocking and Meshing Strategy for an open flow domain over backward facing ramp
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Hello everyone,

There is another older thread with a description and images of the geometry of interest - Blocking and Meshing around a vane vortex generator

I am still working on a simulation with similar objectives to those described in a past thread - Suggestions required for modelling vortex generator with variable angle of attack. One particular domain with a given aspect ratio and vortex generator orientation was fully optimised, blocked and meshed and I have used it for numerous Fluent simulations without any problems.

However, I recently changed the vortex generator vane to half the previous height, and used the exact same blocking and meshing strategy in ANSYS Design Modeler and Meshing. Unfortunately, I keep receiving mesh skewness warnings when I try to import into Fluent and the orthogonal quality is catastrophic. This fell below 3e-3 based on the Ansys Meshing histogram and I have tried several different options including Advanced Sizing and Multizone with mapped-mesh-only, free Hexa-core, free Hexa-dominant amongst others. I really need some help in meshing this geometry and I have observed that users here work with far more complicated geometries so please share your opinions and suggestions.

The edge biased-sizing values were kept exactly the same as the higher vortex generator and this may also need to be changed. I really need to try and find a consistent approach for generating hexahedral meshes with a reasonable orthogonal quality and skewness.

The uploaded geometry and mesh files can be found here - http://www.filefactory.com/file/42a5...owVG-Pos60_msh
http://www.filefactory.com/file/796i.../n/Geom60_agdb

. I look forward to your response.
Attached Images
File Type: png Warning.PNG (30.0 KB, 5 views)
File Type: jpg Blocking.jpg (21.0 KB, 10 views)
File Type: jpg Tunnel2.jpg (45.6 KB, 11 views)
File Type: jpg Tunnel.jpg (17.7 KB, 11 views)
File Type: jpg Outlet.jpg (65.7 KB, 9 views)
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