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Old   July 10, 2014, 06:51
Default Boundary condition
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Mahmudur Rahman Zakir
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Hi,
I am zakir. I am trying calculate ship hull resistance by fluent. I have created structural mesh in pointwise. The of my mesh is attached. to this thread. I am facing difficulty assigning boundary condition to upper surface marked with red arrow in the figure .
I have used side portion as symmetry boundary condition .Is this ok?
Please give me some suggestions.
Thank you in advance.
You can send me email too at zakir_buet08@yahoo.com
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Old   July 10, 2014, 10:19
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Quote:
Originally Posted by zakir212 View Post
Hi,
I am zakir. I am trying calculate ship hull resistance by fluent. I have created structural mesh in pointwise. The of my mesh is attached. to this thread. I am facing difficulty assigning boundary condition to upper surface marked with red arrow in the figure .
I have used side portion as symmetry boundary condition .Is this ok?
Please give me some suggestions.
Thank you in advance.
You can send me email too at zakir_buet08@yahoo.com
Hi,
Using symmetry boundary conditions is ok if only geometry is symmetrical and flow side angle is equal to zero.
What is your problem assigning symm. boundary condition?!
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Old   July 12, 2014, 05:14
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Mahmudur Rahman Zakir
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thank you for your reply . my geometry is symmetrical and flow side is equal to zero. can I use symm boundary condition at the top of the geometry?
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Old   July 12, 2014, 06:13
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Daniele
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If I understand correctly the pink body is the ship, the blue one is the water; If you are assigning a simmetry boundary condition at the top of the water body you are considering that no waves (or very small waves) are present on the water surface: simmetry means zero gradient, so you have a flat water surface.
If considerably big waves are produced simmetry boundary is not correct.

Daniele
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Old   July 14, 2014, 23:36
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Thank you Daniele....
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