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September 25, 2018, 04:29 |
Issue with Mesh Statistics
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#1 |
Senior Member
Join Date: Mar 2013
Location: Germany
Posts: 357
Rep Power: 14 |
Hi All
I am doing a Rotor- Stator Simulation with CFX. It is a Quasi2D Simulation. I tried to do the simulation with different Z direction Extrusion (thickness). And all the time it was one cell thikness (Z = 1mm, 2.5mm, 5mm) just to know the effects of extrusion in the results. But with respect to the MEsh statistics the values are changing which was pretty expected For 1 mm +--------------------------------------------------------------------+ | Mesh Statistics | +--------------------------------------------------------------------+ | Domain Name | Orthog. Angle | Exp. Factor | Aspect Ratio | +----------------------+---------------+--------------+--------------+ | | Minimum [deg] | Maximum | Maximum | +----------------------+---------------+--------------+--------------+ | Rotor | 35.9 ok | 56 ! | 64 OK | | Stator | 36.3 ok | 33 ! | 669 OK | | Global | 35.9 ok | 56 ! | 669 OK | +----------------------+---------------+--------------+--------------+ | | %! %ok %OK | %! %ok %OK | %! %ok %OK | +----------------------+---------------+--------------+--------------+ | Rotor | 0 2 98 | <1 <1 100 | 0 0 100 | | Stator | 0 <1 100 | <1 <1 100 | 0 0 100 | | Global | 0 1 99 | <1 <1 100 | 0 0 100 | +----------------------+---------------+--------------+--------------+ For 2.5mm +--------------------------------------------------------------------+ | Mesh Statistics | +--------------------------------------------------------------------+ | Domain Name | Orthog. Angle | Exp. Factor | Aspect Ratio | +----------------------+---------------+--------------+--------------+ | | Minimum [deg] | Maximum | Maximum | +----------------------+---------------+--------------+--------------+ | Rotor | 43.1 ok | 17 ok | 161 OK | | Stator | 34.9 ok | 34 ! | 661 OK | | Global | 34.9 ok | 34 ! | 661 OK | +----------------------+---------------+--------------+--------------+ | | %! %ok %OK | %! %ok %OK | %! %ok %OK | +----------------------+---------------+--------------+--------------+ | Rotor | 0 2 98 | 0 <1 100 | 0 0 100 | | Stator | 0 1 99 | <1 <1 100 | 0 0 100 | | Global | 0 2 98 | <1 <1 100 | 0 0 100 | +----------------------+---------------+--------------+--------------+ For 5mm +--------------------------------------------------------------------+ | Mesh Statistics | +--------------------------------------------------------------------+ | Domain Name | Orthog. Angle | Exp. Factor | Aspect Ratio | +----------------------+---------------+--------------+--------------+ | | Minimum [deg] | Maximum | Maximum | +----------------------+---------------+--------------+--------------+ | Rotor | 41.2 ok | 17 ok | 321 OK | | Stator | 34.4 ok | 34 ! | 661 OK | | Global | 34.4 ok | 34 ! | 661 OK | +----------------------+---------------+--------------+--------------+ | | %! %ok %OK | %! %ok %OK | %! %ok %OK | +----------------------+---------------+--------------+--------------+ | Rotor | 0 2 98 | 0 <1 100 | 0 0 100 | | Stator | 0 1 99 | <1 <1 100 | 0 0 100 | | Global | 0 2 98 | <1 <1 100 | 0 0 100 | +----------------------+---------------+--------------+--------------+ So now my doubt is what exactly is this expansion factor and how is it controlled ? Is it ok to have these values and still run the simulation ? I am running it in Double Precision. If you see the Aspect Ratio value its going high and they mention it as OK. Normally the Aspect ratio has to be 1 right ? Kindly correct me if I am wrong. !! |
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September 25, 2018, 07:21 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
If it converges and the results are accurate then it is fine.
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