CFD Online Discussion Forums - negative efficiency!!

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firespring

November 24, 2003 20:44

negative efficiency!!

When I simulate a turbine impellor's flow,the efficiency is negative,Why!

NUMECA-Beijing

November 25, 2003 20:24

Re: negative efficiency!!

Hello Zhang,

Solver blows up, incorrect BC or rotationary settings may lead to such problems.

However, we would like to invite you to send email to support@numeca-beijing.com , describing you case details, your settings, etc. We then can process this support request.

Regards

Support center of NUMECA-BEIJING

SAM	September 26, 2004 22:41

Re: negative efficiency!!

this may be due to defining rotatin axis

give value for rotaing axis as -1 instead of +1

Bye

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