# Boundary condition

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July 10, 2014, 06:51
Boundary condition
#1
New Member

Mahmudur Rahman Zakir
Join Date: Sep 2013
Posts: 5
Rep Power: 5
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?
You can send me email too at zakir_buet08@yahoo.com
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July 10, 2014, 10:19
#2
Senior Member

Ehsan Asgari
Join Date: Apr 2010
Posts: 306
Rep Power: 9
Quote:
 Originally Posted by zakir212 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?!

 July 12, 2014, 05:14 #3 New Member   Mahmudur Rahman Zakir Join Date: Sep 2013 Posts: 5 Rep Power: 5 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?

 July 12, 2014, 06:13 #4 Senior Member     Daniele Join Date: Oct 2010 Location: Italy Posts: 993 Rep Power: 17 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 zakir212 likes this.

 July 14, 2014, 23:36 #5 New Member   Mahmudur Rahman Zakir Join Date: Sep 2013 Posts: 5 Rep Power: 5 Thank you Daniele....

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