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October 20, 2009, 08:11 |
Fluent 6.3 32bit vs Fluent 12.0 64bit
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#1 |
New Member
khalis
Join Date: Sep 2009
Location: Malaysia
Posts: 5
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Hi all. I'm in need of help.badly. Recently, I did some simulations of MAV using Fluent 12 and what I really interested in was lift coefficient, CL and drag coefficient, CD. But to my dismay, the fluent 12 gave very small value of CL, in magnitude of -7x10^-3 and CD was around 2x10^-1. My supervisor was unhappy with the value of CL and I used fluent 6.3 to see if there was any differences. At the end of iteration of fluent 6.3, the value of CL is far more closer than what my supervisor had expected. So, my question is, does these 2 versions of Fluent give significant difference in results? Could some one please tell me which version is really useful in giving accurate results? Both simulation used the same source of case file. Now, I begin to suspect that fluent 12 64bit gives more accurate results because I'm using 64bit Windows 7 Ultimate. Native application meets the native OS. Fluent 6.3 was used on my PC as comparison. My PC specs: Intel C2D 1.8GHz Windows 7 64Bit Ultimate Edition 7GB of RAM
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October 20, 2009, 09:17 |
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#2 |
Senior Member
Svetlin Filipov
Join Date: Mar 2009
Location: United Kingdom
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Try to install the two versions on one and the same OS... After that you can conclude. In fact... Fluent is not a "system" code, so it is expected to give equal results.... Try to find the different options in the two versions ... some default values may be added that are not present in the 6.3.26...
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October 20, 2009, 10:00 |
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#3 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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*comparison of residuals
*comparison of pressure distribution *comparison of velocity distribution *comparison of other quantities *serial/parallel computing? (watch out you may not call a case file from an x computation, and load the data file from an y computation --> typical: case pre-processing on serial, switch to parallel... run, and save ONLY data from parallel... After a read case AND data, you get weird results for sure) in other word, it is debugging! (and it also belongs to CFD) But you shouldn't have huge difference between 2 computations. On the other hand (as Philipv mentionned), you shouldn't have exactly the same result
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In memory of my friend Hervé: CFD engineer & freerider |
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October 20, 2009, 10:21 |
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#4 | |
New Member
khalis
Join Date: Sep 2009
Location: Malaysia
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Quote:
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October 26, 2009, 04:21 |
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#5 | |
New Member
khalis
Join Date: Sep 2009
Location: Malaysia
Posts: 5
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Quote:
Now, I'm running the simulation in parallel using fluent 12.0 since fluent 6.3.26 can't be setup for parallel processing on my personal pc. |
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October 26, 2009, 04:29 |
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#6 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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Get the force on the body (where you get your Cd & Cl), you will have the force from pressure and viscosity.
Compare your results, and you will see where is the difference (pressure or viscosity). If results are the same, then your problem is on the reference values
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In memory of my friend Hervé: CFD engineer & freerider |
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October 30, 2009, 02:53 |
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#7 |
Member
Join Date: Sep 2009
Posts: 69
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Hi ibex7,
Did you have any problems setting up fluent parallel, or it was just a case of using default settings when running parallel? I am having a problem running fluent parallel atm. I have a new i7 running windows 7 home premuim. It just keeps hanging everytime it tries to create a new process. Serial works fine though. Any thoughts? |
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April 18, 2011, 03:44 |
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#8 | ||
Senior Member
raymond
Join Date: Nov 2009
Posts: 149
Rep Power: 17 |
Quote:
Quote:
Dear All, I am working with window 7 professional 64 bit operating system. While installing Fluent version 6.3.26 (64 bit), message appears as below: This installation does not support window operating system.....(seem like do have compatibility issue) Were you all facing this problem before? How you guys solve it? Any suggestion to me? Thanks for help. Best regards |
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