high drag value

April 5, 2005, 07:49

hi i am modelling only the under water portion of planing craft. we are using sinkage and trim values obtained from experiments. at low speed fluent is giving drag comparable with experiments. but at high speeds(5m/s) the drag values are 5 times the experimental.

what should i do to get the correct drag.

i have tried using all the turbulence models and differnt domain and also using different mesh sizes.

expecting your reply asap

thanking u in advance

sulfi

April 8, 2005, 20:27

Hi Sulfi,

Can you tell me your domain and your mesh size. Are you sure that your reference values are correct?

Sham.

April 5, 2005, 07:49	high drag value	#1
sulfi Guest Posts: n/a	hi i am modelling only the under water portion of planing craft. we are using sinkage and trim values obtained from experiments. at low speed fluent is giving drag comparable with experiments. but at high speeds(5m/s) the drag values are 5 times the experimental. what should i do to get the correct drag. i have tried using all the turbulence models and differnt domain and also using different mesh sizes. expecting your reply asap thanking u in advance sulfi

April 8, 2005, 20:27	Re: high drag value	#2
Sham Guest Posts: n/a	Hi Sulfi, Can you tell me your domain and your mesh size. Are you sure that your reference values are correct? Sham.

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