[vikas171092]

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 …}

[p.galimutti]

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.

[vikas171092]

Thanks for answering.

How can i make a rectangular gird at inlet and evaluate velocities at gird points location ??

[Far]

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

[p.galimutti]

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

[vikas171092]

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.

[p.galimutti]

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

[vikas171092]

Thanks !! It worked