2D counter flow heat exchanger analysis using chtMultiRegionSimpleFoam
I am doing Maters project in CFD using openFOAM. As a part of a project, I am working on chtMultiRegionSimpleFoam solver using the test case "2D counter flow heat exchanger" from the literature "A note on the solution of conjugate heat transfer problems using SIMPLE-like algorithms. Xi Chen *, Peng Han"
I am getting the fluid part temperatures almost correct but a difference of 50K is observed in solid part. The difference is constant thought the solid part. I have checked BCs and input values and they are ok. I am clueless where the problem is.
I have attached the case and the comparison graph. can anyone please go through the case and suggest?
Thanks in advance,
Greetings Prasad and welcome to the forum!
It looks like:
About your case:
Thanks for your time. I am using blueCFD2.1.1. I have taken the values across the HE at L = 0.5.
I have tried couple of variations in numerical schemes and got mixed results. First I tried with SFCD, linearUpwind and both had no improvement in the results. With QUICK scheme, the results were improved and the deviation this time was around 10K. :-) The mesh refinement in the fluid and solid regions did not help much.
Revised comparison graph is attached.
I have a quick question. Interpolation scheme 'linearUpwind' is described as 'first/second order, bounded' and how do we ensure to enforce first or second order specifically? Or on what basis program will consider the specific order?
I don't have access to the paper, so I don't know the specifics of how the paper generated the data, in order to estimate what might be the best approach. It could also be a problem with the turbulence model or fluid properties.
As for "linearUpwind", a quick search lead me to this thread, although I did not fully read it: http://www.cfd-online.com/Forums/ope...tedlinear.html
Sorry for the late reply. I got tied up with some other work.
The case is based on laminar flow and fluid properties are given as stated in the literature. I could not attach the literature document because of large file size. Instead please download it from the below dropbox link.
I presume chtMultiRegionSimpleFoam can be used for incompressible fluids such as water. I searched in forum and found no concluded answer or did miss the right post?
I am also trying to work out on incompressible version of cht...foam chtIcoMultiRegionSimpleFoam which is available in forum. I am finding it difficult to set up a test case. Is there any test case already run for this solver? I could not locate one on forum.
Sorry, I don't have much patience to look at this with much more attention (it's been a very long week), but the following properties look suspicious to me, at least on the solid side:
The paper stipulates that the solid part has the following properties:
As for the other solver you mentioned: I'm not familiar with it.
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