[riverajor]

Dear CFD-Online Community,

I have been working on a hexa blocking mesh in ICEM. I have tried for so long to achieve a proper Ogrid at the T-Joint of a tube in tube heat exchanger.

My problem is that when I try to generate the Ogrid, the blocks that belong to the inner tube of the heat exchanger do not allow the proper generation of the Ogrid.

Do you have any strategy to tackle down this issue? I would be very grateful for any comments or suggestions.

[shereez234]

Originally Posted by riverajor

Dear CFD-Online Community,

I have been working on a hexa blocking mesh in ICEM. I have tried for so long to achieve a proper Ogrid at the T-Joint of a tube in tube heat exchanger.

My problem is that when I try to generate the Ogrid, the blocks that belong to the inner tube of the heat exchanger do not allow the proper generation of the Ogrid.

Do you have any strategy to tackle down this issue? I would be very grateful for any comments or suggestions.

For the pipe/tube that's going in X direction -> while trying to generate the inner O grid select the main block and the parallel faces too.

[riverajor]

Originally Posted by shereez234

For the pipe/tube that's going in X direction -> while trying to generate the inner O grid select the main block and the parallel faces too.

Dear Shereez234,

thank you so much for your reply. Your piece of advice helped me a lot. I just wanted to check with you, if I understood you right. I generated the O-Grid as seen on the first screenshot.

I tried the same strategy for the connection between the heat exchangers (please see the second screenshot), but then the elements show a negative orthogonal quality. Do you have any recommendations?

Thank you so much once again for your support.

[mluckyw]

Okay, I don't know if it solved or not but the curiosity bit me first .

So You need a combined O-grid in the blocking, not separated O-grid. The selection are like the attachment below, it's a bit hard to visualize. PM me your email if you want the file for this mesh.

Edit: Basically, select all the blocks and select the face where you don't want any O-grid generated ie, opening, inlet, outlet

[riverajor]

Originally Posted by mluckyw

Okay, I don't know if it solved or not but the curiosity bit me first .

So You need a combined O-grid in the blocking, not separated O-grid. The selection are like the attachment below, it's a bit hard to visualize. PM me your email if you want the file for this mesh.

Edit: Basically, select all the blocks and select the face where you don't want any O-grid generated ie, opening, inlet, outlet

Dear Chrowale,

thank you so much for your suggestion I will try it out. In the meantime, I have send you my email address in a PM.