Making new inlet boundaries
 

I have a series of holes in my mesh. The mesh was created in ICEM CFD by someone else. All the holes are defined as one mass flow inlet. Some holes are differnt diameters, but have the same boundary conditions. I would like to explode them and make each hole a separate mass flow inlet. I want to do this to show the path lines on each inlet. Cause showing all of them at the same time takes my computer forever since the grid is over a million cells. I have tried to find a way to do it in Fluent but cannot. Am I going to have to go back to the mesh processor to do this? I know I can save the mesh as a mesh file in Fluent and then go to Gambit. I was hoping I wouldn't have to do that. Thanks

Re: Making new inlet boundaries
 

There is one easy way to do it, but that means u have to give the whole run again, and I don't think you want to do that. Anyway this is what I have in mind, save the cas file. Import the mesh in gambit, now if it is successfully imported, you can define all the inlets with different name, export the mesh and reread it in fluent. Might work. Import in gambit can fail in case you have done some grid adaptation and there are hanging node, I mean I have seen it failing in this case. Best of luck.

Re: Making new inlet boundaries
 

Or another far easier way would be to go to

Grid -> Separate -> Faces

If you select the mass flow inlet and separate the faces of the inlet using one of the options, you can then rename each face as a separate inlet face.

This way you wont have to re-run the simulation either.

Hope this helps

Re: Making new inlet boundaries
 

If you take one of the mass flow inlets, you have about 134 faces. Now I have 28 mass flow inlets that are currently tied together as one whole mass flow inlet. Now if I do the separate faces I get about 3765 zones. This is not what I want. I want to take the mass flow inlets as a whole and explode them into 28 new separate boundaries. I believe this can't be done in Fluent and have to do it in Gambit unless someone has found a way to do it.

Re: Making new inlet boundaries
 

Have you actually tried to do what Tom suggested. The result should be 28 separate zones. It should not subdivide the zone by its faces. Check with "report" in grid-separate panel and look at the final line not at the lines above.

Alternatively you can create a post-processing plane, or a post-processing surface by means of surface-transform ans surface-isoclip.

Re: Making new inlet boundaries
 

After you have sub-divided the faces and fluents creates 28 new zones, just re-name them and set the boundary condtions separatly as normal. Your can rename each zone or even merge them back together if you want. I know this works becuase I have done it many times before.

When you separate them use the Angle option and use the report function to see how many zones it will split up into. Change the angle till you get 28 zones them you can separate the zone.

Re: Making new inlet boundaries
 

Ok, I got it to work. I must have been doinf something wrong earlier. Appreciate the help.

Re: Making new inlet boundaries
 

My pleasure.