# water pump intakes

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May 30, 2012, 14:49
water pump intakes
#1
New Member

vikas
Join Date: Dec 2011
Posts: 18
Rep Power: 6
I am working on a CFD (Computational Fluid Dynamics) model of water pump intakes for cooling systems using Ansys 13.0 (Fluent) software.

I have attached the geometry on which I am working and have few doubts

1) 1) Do I need to give thickness to the pipes and other geometries in order to specify inside part as fluid{water} and outside part as wall {Mild steel}

2) 2) What boundary conditions do I need to specify to the top free surface { i.e pressure inlet or symmetry or pressure outlet …}

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 May 30, 2012, 15:09 #2 Member   Peter Galimutti Join Date: May 2012 Posts: 37 Rep Power: 6 you need to extract fluid volume from your geometry. For that you can extract it manually or use 'fill' option in ansys geometry. For example take a case of a pipe of some length 'L' and inner diameter 'di' & outer diameter 'do'. Now extracting fluid means creating a volume of fluid going through that pipe which will be a cylinder of length 'L' and diameter 'di'. You do not need to worry about solid material. However if you are doing H.T, you can define the thickness of wall in fluent and the thermal b.cs. The outer surface is usually termed as 'wall', but can be periodic, symmetric depending on how your fluid model is. Good thing is fluent automatically sets wall boundaries on those that are not defined when meshing.

 June 2, 2012, 08:08 Rectangular Grid #3 New Member   vikas Join Date: Dec 2011 Posts: 18 Rep Power: 6 Thanks for answering. How can i make a rectangular gird at inlet and evaluate velocities at gird points location ??

 June 2, 2012, 11:48 #4 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,301 Blog Entries: 6 Rep Power: 43 Are you asking about the hexa mesh? I have created the series of video tutorials for making mesh in ICEM CFD. Here is the link YouTube ICEM tutorials

June 4, 2012, 13:45
#5
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Peter Galimutti
Join Date: May 2012
Posts: 37
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Quote:
 Originally Posted by vikas171092 Thanks for answering. How can i make a rectangular gird at inlet and evaluate velocities at gird points location ??
I did not quite understand what you want to do?

You would want to have grid for the whole domain to evaluate velocity.

Don't you have inlet velocity/ pressure/ mass flow ?

For your geometry you can easily get a hexa mesh (rectangular as you say) using workbench. Try using 'mapped meshing' and 'sweep methods' in Ansys Meshing. You may need to go through Ansys meshing tutorials for getting some decent expertise in hexa meshing.

HTH

 June 5, 2012, 05:07 #6 New Member   vikas Join Date: Dec 2011 Posts: 18 Rep Power: 6 I want to evaluate velocities at various points on a particular face (inlet in my case). I tried point cloud tool but, it didn't worked for me. So i thought of making rectangular gird at inlet.

 June 5, 2012, 22:52 #7 Member   Peter Galimutti Join Date: May 2012 Posts: 37 Rep Power: 6 Its very simple. Just export the velocity (u,v,& w) data at the 'inlet'. You'll be able to get a .csv file of the velocity values and their physical co-ordinates. HTH

 June 7, 2012, 14:28 #8 New Member   vikas Join Date: Dec 2011 Posts: 18 Rep Power: 6 Thanks !! It worked

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