2D counter flow heat exchanger analysis using chtMultiRegionSimpleFoam
2 Attachment(s)
Dear Foamers,
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, Prasad |
Greetings Prasad and welcome to the forum!
It looks like:
About your case:
Bruno |
1 Attachment(s)
Hi Bruno,
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? Thanks, Prasad. |
Dear Prasad,
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 Best regards, Bruno |
Dear Bruno,
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. http://db.tt/6qrj6vRH 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. Thanks, Prasad |
Hi Prasad,
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: Code:
constSolidThermoCoeffs The paper stipulates that the solid part has the following properties: Quote:
As for the other solver you mentioned: I'm not familiar with it. Best regards, Bruno |
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