# [ICEM] Two liquids flowing counter current in concentric tube

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 April 26, 2010, 01:35 Two liquids flowing counter current in concentric tube #1 Member   Sujay Join Date: Apr 2010 Location: Karnataka, India Posts: 40 Rep Power: 7 Two liquids are flowing counter current to each other in tube without mixing. one liquid (liquid 1)enters from top in inner tube and leave from bottom at 1500 0 C Other (liquid 2)enters at bottom in outer tube and leave at 30 0 C. Both these liquid have differnt properties and doeas not mix. How to create geometry in ICEM and Solve in CFX? the concentric tube is made up of copper. Last edited by sujay; April 26, 2010 at 08:46.

 April 26, 2010, 08:30 Easy... #2 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 35 That is a very open question... But it will be pretty easy. Tetra or Hexa, you just need material points for each of the regions. You didn't mention if you would have a solid region between the materials, but I will assume you will. If you go with Tetra, flood fill (part of the regular process) will automatically assign the volume elements to the right materials based on the material point locations. You will also want to grow prisms into each of the fluid regions. If it is Hexa, you would use an Ogrid with its center H grid well within the inner pipe, then split the Ogrid for each of the layers and assign the blocks to the different materials. When you output the mesh, tell your solver which materials are fluid and which are solid and it shouldn't have any problems.

 April 26, 2010, 08:49 #3 Member   Sujay Join Date: Apr 2010 Location: Karnataka, India Posts: 40 Rep Power: 7 Please tell me more. I want to go with tertra mesh. The tubes are made up of Copper. But how to say two differnt liquids in CFX.

 April 26, 2010, 23:50 #4 Member   Sujay Join Date: Apr 2010 Location: Karnataka, India Posts: 40 Rep Power: 7 Do i need to create two solid domain (tube) and two fluid region ? four material point ?

 April 28, 2010, 02:57 #5 Member   Sujay Join Date: Apr 2010 Location: Karnataka, India Posts: 40 Rep Power: 7 Ok, I am able to make the geometry having four doamain. Will it take the values at each interface on it's own or we have to speicify the interface conditions.

 April 28, 2010, 10:55 Solver question... #6 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 35 The amount of work required to setup the solid/fluid interfaces varies from solver to solver. It is pretty automatic in more modern commercial solvers like "ANSYS Fluent" or "ANSYS CFD". If you mesh it all at once in ICEM CFD, you will have node for node connected meshes with a layer of shells (quads or tris) between the volumes. I would probably just make sure that the surface part between each pair of volumes has its own name (such as INTERFACE_COPPER_FLUID1) and your solver can probably figure out the rest. You can confirm on your solvers forum or just try it and see. Simon

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