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December 13, 2017, 05:59 |
tangential vector tolerance wall
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#1 |
Senior Member
Davide
Join Date: Jul 2015
Posts: 107
Rep Power: 10 |
Anyone knows how to change the expert parameter "tangential vector tolerance wall" in CFX? Because I see only the parameter tangential vector tolerance without "WALL"..
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December 14, 2017, 08:16 |
Problem
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#2 |
Senior Member
Davide
Join Date: Jul 2015
Posts: 107
Rep Power: 10 |
I must solve the fluidynamic inside a tire of a car to study the behaviour of the braking system. So in a steady state in CFX I set that some components have a rotating velocity. Due to the complexity of the geometry I have made an unstructured mesh, but when I starts the run CFX tells me that the angle between the specified velocity and the element surface is higher, so it suggests to increase the tolerance in the expert parameter "tangential vector tolerance wall" from its default of 20 degrees. The problem is that this expert parameter there isn't. Someone knows how to find this expert parameter that probabilly exist but is hidden???
Thank you |
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December 14, 2017, 18:55 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,696
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Are you sure you are not prescribing a normal velocity somewhere? The default of 20 degrees is plenty for most applications so if you infringe this it probably means something is wrong with your mesh or geometry - increasing the tolerance is rarely the appropriate response.
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December 15, 2017, 08:33 |
expert parameter
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#4 |
Senior Member
Davide
Join Date: Jul 2015
Posts: 107
Rep Power: 10 |
No my domain is a cubic box in which there is the tire with the braking system in the interior. In a face of the cubic domain I set the velocity inlet condition, while in the tire I set a wall no slip condition with a wall rotating velocity. Do you know how to find the above expert parameter, because I would try to solve my problem without changing the mesh.. Therefore my problem is that the expert parameter "tangential vector tolerance wall" in reality I cannot find in CFX... Can you help me to find this expert parameter?
Thanks |
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December 15, 2017, 08:34 |
Expeet parameter
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#5 | |
Senior Member
Davide
Join Date: Jul 2015
Posts: 107
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Quote:
Thanks |
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December 15, 2017, 17:55 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,696
Rep Power: 143 |
I am not on my workstation today so cannot look this up for you. But please note my previous post - this is probably caused by a meshing error which should be fixed by fixing the meshing error, not by allowing a larger tolerance.
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December 18, 2017, 08:53 |
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#7 |
Senior Member
Davide
Join Date: Jul 2015
Posts: 107
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ok thanks, when you are on your workstation can you look if you find this expert parameter?
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December 18, 2017, 09:48 |
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#8 |
Senior Member
Lance
Join Date: Mar 2009
Posts: 669
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I agree with Glenn, this is probably a mesh issue.
But anyway, some expert parameters are hidden in the gui so if you really want to change the it the following trick might work: open expert parameters, check "tangential vector tolerance", hit apply, close tab. right click expert parameters in the tree, edit in command editor. enter: tangential vector tolerance wall = 20.0 note: I havent tried it, it might not work, and you really should see if you can improve your mesh instead. |
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December 18, 2017, 10:42 |
Great
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#9 | |
Senior Member
Davide
Join Date: Jul 2015
Posts: 107
Rep Power: 10 |
Quote:
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