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Help in Modelling Swirl Flows in a Cyclone
Posted Thu August 25, 2005 @05:17PM
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Help Desk Malou writes "Hi CFD Review forum members,

My name is Maria Lourdes Aguja and I am a masters student at the Hamburg University of Technology in Germany.

I am doing my masters thesis now and am using CFX to simulate the results and findings of Dipl.-Ing. Andreas Gorton-Hülgerth from the Technischen Universität Graz in his paper 'Messung und Berechnung der Geschwindigkeitfelder und Partikelbahn im Gaszyklon' dated December 1998. It's about gas flow in a cyclone. His paper is our reference as he worked with a cyclone unit with D=0.40 meter and H=1.0 meter. The aim of my paper is to successfully adopt his approach and apply this to an industrial-size unit.

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However, Mr. Hülgerth used Fluent and I am using CFX 5.7.

Our values and trend for axial and radial velocities (his from LDA measurements) seem to be similar but the discrepancies are huge for those in the tangential direction. We both used Reynolds Stress Models that are said to be best in modelling swirl flows but I still cannot find anything that will make my model similar to his and to data calculated using established Muschelknautz equations. His findings using LDA measurements and Fluent, by the way, are comparable.

My question therefore is if anybody here has tried to compare results for the same simulation using both CFX and Fluent and if problems were encountered. I have come to some sort of a dead-end and have changed as much parameters available to me as I could but to no avail. Specifying specifying certain coefficients instead of the program's default values would also not cause major differences in results, I was told by another researcher.

So now I am starting to suspect that the difference could lie in the programs themselves.

Any help would be greatly appreciated.

Best regards,
Maria Lourdes Aguja"

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