[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

[syavash]

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?!

[zakir212]

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?

[ghost82]

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]

Thank you Daniele....