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January 11, 2014, 05:48 

#41 
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In my opinion one of the biggest advantage is that PowerFLOW is really stable and it is almost impossible to get a simulation to blow up (unless you are making big setup mistakes or your geometry has serious issues).
Besides, as you already pointed out, PowerFLOW is a transient (and transient only) code. If you need transient results, a simulation performed with PowerFLOW will take less time (much much less time) than a DES or LES. On the other hand, if you can do with steady results, PowerFLOW will take more time to solve the case than a RANS simulation. Eventually the mesh: meshing is relatively quick and you can get a lot of cells without any problem. The volume mesh is a cartesian grid made of hexahedra so no issues nor skewness nor stretching with 3D elements. 

January 13, 2014, 05:15 

#42  
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Quoting their website: Quote:


January 13, 2014, 07:42 

#43  
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Let me rephrase my statement: If you can do with steady state results then PowerFLOW will (of course) take more time than a RANS to give you your results (it will perform a transient simulation anyway and then you can average your results in order to have something similar to a RANS). If you need transient results (such as the ones a LES or a DES will provide you) then your case will be solved in much less time than a LES/DES. 

January 13, 2014, 12:42 

#44  
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Do you have any comparisons / papers on this? I would be very much interested in seeing the hard facts on this, as I'm very much interested in accuracy and efficiency of numerical methods for LES. It would be nice to have a test case with comparable DOF, LES with a NS based solver (if it is a good one ) and Powerflow, compared against DNS. Is there a paper on DNS comparison of LB and DNS? I guess there must be, and for low Knudsen numbers, they should indeed give the same results.... 

January 13, 2014, 14:56 

#45  
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http://exa.com/web_support_2012/exa_tech_pubs.html Not sure if you can find what you are looking for though… Also on sciencedirect you can find lots of papers by looking for "powerflow". 

Tags 
aeroacoustics, aerodynamics, exa, lbe, powerflow 
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