Modeling a cross flow in a staggered tube bundle using ANSYS CFX

ashraf88 · December 16, 2012, 10:42

Hi every one,

Task: Modeling a cross flow in a staggered tube bundle using ANSYS CFX.

Given: The fluid is water of 300 deg Clausius flowing with inlet velocity 1 m/s,the boundary conditions are defined very well.

Problem: The results shows that water temperature is not changing along the domain; water temp. inlet same as outlet.

So I am not sure about the reason of that, Turbulence model, or water velocity, Heat transfer mode ( Total energy or Thermal Energy) ?

Please help me .

ghorrocks · December 16, 2012, 16:29

First of all, please do not hijack threads. Start a new thread for a new question - especially when your question is not related to the original thread.

This problem could be caused by many things - it could be inaccuracy in your simulation (see http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F for tips) or it could be that the setup you are modelling does not result in significant heat being transferred to the water. From the sketchy details you have posted I cannot tell.

Also - are you sure you are using a thermal model? You would not get any heat transfer if you have not enabled thermal modelling. Also how have you modelled the tube bank?

ashraf88 · December 16, 2012, 21:21

Quote:

Originally Posted by ghorrocks

First of all, please do not hijack threads. Start a new thread for a new question - especially when your question is not related to the original thread.

This problem could be caused by many things - it could be inaccuracy in your simulation (see http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F for tips) or it could be that the setup you are modelling does not result in significant heat being transferred to the water. From the sketchy details you have posted I cannot tell.

Also - are you sure you are using a thermal model? You would not get any heat transfer if you have not enabled thermal modelling. Also how have you modelled the tube bank?

Dear ghorrocks,
I really appreciate your replay, I am so sorry that i didn't started a new thread.
I am sure that I am using the thermal modeling. But what I am not sure about is that may be I didn't make the setup well.
The tube bank is modeled as a cylinders, not Conjugate heat transfer
Thanks so much for your kind response

ghorrocks · December 16, 2012, 21:27

Can you post an image? Also your CCL would help.

December 16, 2012, 10:42	Modeling a cross flow in a staggered tube bundle using ANSYS CFX	#1
ashraf88 New Member ASHRAF ALFANDI Join Date: Oct 2012 Posts: 8 Rep Power: 2	Hi every one, Task: Modeling a cross flow in a staggered tube bundle using ANSYS CFX. Given: The fluid is water of 300 deg Clausius flowing with inlet velocity 1 m/s,the boundary conditions are defined very well. Problem: The results shows that water temperature is not changing along the domain; water temp. inlet same as outlet. So I am not sure about the reason of that, Turbulence model, or water velocity, Heat transfer mode ( Total energy or Thermal Energy) ? Please help me .

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December 16, 2012, 16:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 6,980 Rep Power: 59	First of all, please do not hijack threads. Start a new thread for a new question - especially when your question is not related to the original thread. This problem could be caused by many things - it could be inaccuracy in your simulation (see http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F for tips) or it could be that the setup you are modelling does not result in significant heat being transferred to the water. From the sketchy details you have posted I cannot tell. Also - are you sure you are using a thermal model? You would not get any heat transfer if you have not enabled thermal modelling. Also how have you modelled the tube bank?

December 16, 2012, 21:27		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 6,980 Rep Power: 59	Can you post an image? Also your CCL would help.