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Kuba Broniszewski February 20, 2007 17:11

added mass
Hi! Has anybody been concerned by the problem of added mass in the presence of free surface? We are starting to investigate this phenomenon on the models in the laboratory and we want to compare our results with CFD calculations. What kind of UDF sholud be written?


Kuba Broniszewski

Bak_Flow February 23, 2007 09:52

Re: added mass
Dear Kuba,

can you explain the physics of the problem better.

Are you refering to "virtual mass" which is a term that shows up when one looks at the force on a submerged body moving through a fluid?



kp February 23, 2007 10:39

Re: added mass
Bak yes it is indeed the same. Virtual mass is important in two instnaces 1. While trying to dampen the instantaneos fluctaution in turbulence..Tchens theory, 2. In bubbly flows. Fluent cannot handle VM properly in momentum eqautions. Leads to divergence for gas liquid flows. but I have made it possible to work wiht it. Is tricky. If yo encounter difficualites mail me at

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