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sliding mesh or dynamic mesh for transient simulation |
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#1 |
New Member
zagros
Join Date: Apr 2022
Posts: 19
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hi everyone. i want to simulate an oscillating-pitching- airfoil in unsteady flow situation. which one of these methods do you think is good? sliding mesh or dynamic mesh? and why?
with regards. |
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#2 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,928
Rep Power: 28 ![]() |
That depends on how your geometry looks like and the degrees of freedom it has.
With 2DOF, it can rotate around a fixed axis, put it in a cilinder. With 3DOF, it can rotate around a point, put it in a sphere. With 4DOF or more, it can also translate, then you require dynamic mesh. |
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#3 |
New Member
zagros
Join Date: Apr 2022
Posts: 19
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well my geometry is 2d. and i put it in a circle and use the udf to rotate. but the problem is that when I run it, inner zone flow moves in a circle at first.
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#4 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,928
Rep Power: 28 ![]() |
This is 2DOF. Your wing can only rotate around a fixed axis.
But why is it a problem? Is the wing rotating to a neutral position? Shouldn't it do this? If not, then what do you expect? I can't read your mind. And I don't know what is in your udf. Do you refer to the udf to describe the DOF? Or does it describe the wind fluctiations? Unclear to me........ |
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