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April 23, 2009, 00:57 |
CFX vs Flow-3D Benchmark
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#1 |
Senior Member
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Hi All Users
Would like to understand if anyone has performance benchmark studied between CFX vs Flow-3D? especially focus on VOF and moving meshing options. Thanks in advance |
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April 23, 2009, 19:35 |
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#2 |
Super Moderator
Glenn Horrocks
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Hi,
I have done a simple comparison so have some comments. Flow3D can't do moving mesh per-se, it does it by having a fixed background mesh and sweeps the bodies over it. This approach is much simpler than the moving mesh approach of CFX, but the full moving mesh approach means you can have a more tailored grid with wall refinement and other refinements. If accurate boundary layer resolution is important that will be tricky in Flow3D. Flow3D has many VOF technologies CFX does not have. The single fluid VOF model in Flow3D is fantastic if it is appropriate to your model. It will run much faster than CFX's multiphase VOF model (like 100 times faster in some applications) but I had problems getting it to give me sensible droplet shapes when surface tension was activated. If you are doing lots of VOF then I definitely recommend you look at Flow3D. But on the other hand I found Flow3D's interface to be poor compared to CFX, and CFX has many features Flow3D does not have (CEL, extensive scripting, advanced multiphase/chemistry). Which is best depends on what you want to do. They both have strengths and weaknesses. Glenn Horrocks |
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April 23, 2009, 21:15 |
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#3 |
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Hi Glenn Horrocks
Thanks for your details reply, but which Flow-3D & CFX version that you did benchmark last time? and under which application? Thanks |
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April 23, 2009, 21:19 |
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#4 |
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Hi Glenn Horrokcs
Btw can you share the comparison results with me? any web link available? |
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April 23, 2009, 21:28 |
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#5 |
Super Moderator
Glenn Horrocks
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Hi,
I have used CFX from version 3 (!) up to the beta version of V12 and everything in between. I have used it for over 10 years. The Flow3D version was 9.3, we trialled it a few months back. I have not used Flow3D before except during this trial. The application is commercial and I am not at liberty to disclose details. So no, you can't see the results and definitely no web pages. I will say it is simulating inkjet printers but I cannot give any more detail than that. Glenn Horrocks |
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April 24, 2009, 03:01 |
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#6 |
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Hi
I believe you are the expert in CFX. So for inkjet droplets simulation which CFD program predicted most accurate result compared to actual data? Thanks again. |
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April 24, 2009, 08:48 |
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#7 |
Super Moderator
Glenn Horrocks
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Which was more accurate? Neither. We currently use Fluent! Don't forget accuracy is only one consideration... cost, ease of use, software stability, physics relevant to your intended model, quality of support, ability to scale to large simulations etc etc also are important.
Glenn Horrocks |
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April 26, 2009, 21:42 |
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#8 |
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So is that means Fluent are the best among CFX & Flow-3D in this droplet VOF simulation?
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April 26, 2009, 21:50 |
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#9 |
Super Moderator
Glenn Horrocks
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Hi,
What is your application? Glenn |
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April 27, 2009, 02:11 |
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#10 |
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similar to Inkjet simulation, where the droplets is generated through VOF and need to travel/move along a path during the droplets generation. so what is your comments?
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April 27, 2009, 02:33 |
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#11 |
Super Moderator
Glenn Horrocks
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Hi,
You already have my comments - I recommend you try Fluent and/or Flow3D. Glenn Horrocks |
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April 27, 2009, 04:53 |
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#12 |
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I may not have luxury to try both, so based on your experience which one (Fluent vs Flow-3D) provided better accuracy and shorter simulation time? Thanks again.
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April 27, 2009, 22:31 |
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#13 |
Super Moderator
Glenn Horrocks
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Hi,
I would have to know more about what you are trying to do to give a recommendation! Glenn Horrocks |
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April 28, 2009, 01:09 |
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#14 |
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Hi
pls advice what additional information is needed? Thanks |
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September 13, 2009, 23:23 |
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#15 |
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YongDazztech
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Hi,
I have been using ansys cfd and flow3d. For comparisons, I would give higher grade for Ansys in graphical presentation. However, I would still prefer flow3d for its multi-physics capability to simulate great models. |
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September 14, 2009, 08:47 |
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#16 |
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George
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ring Ansys and Flow3D sales team, give them a problem description and request them to benchmark their software against your problem. If you are to buy a license from either of them it shouldn't be a problem.
__________________
Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials |
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June 1, 2010, 18:33 |
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#17 | |
Senior Member
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Quote:
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June 1, 2010, 19:34 |
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#18 |
Super Moderator
Glenn Horrocks
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Your question states the answer - if you need RSM models then you need a solver which supports RSM models and that counts Flow3D out and leaves you with CFX.
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June 2, 2010, 03:19 |
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#19 | |
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Fatema Zandi Goharrizi
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Quote:
thanks for your advices in another post about VOF in CFX you have mentioned that: "There is nothing "wrong" with the free surface modelling in CFX, it is just that it does not capture the interface as sharply as some other approaches. Whether this is a problem or not depends on the application. CFX has been successfully used on many free surface applications" is it right to say that CFX is weak in specifying the free surface place? I have to read the documentations but would yu help me with the method that CFX use for free surface? be cause the Eulerian Eulerian method in multiphase modeling is not recomended for multiphase systems that researches would be done about finding the interface of two phases thank you |
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June 2, 2010, 09:42 |
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#20 | ||
Super Moderator
Glenn Horrocks
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Quote:
Quote:
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