# how to study fans????

 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 31, 2005, 16:21 how to study fans???? #1 alexis Guest   Posts: n/a hi!! I'm working on a fan optimisation with the cfx571 cfd software. The fan i am studing is a part of an machine. So to optimize the fan and so the airflow throught the machine, i have to consider the pressure looses. How can i simply represent the pressure looses without represent all the geometry of the machine?

 March 31, 2005, 18:24 Re: how to study fans???? #2 Glenn Horrocks Guest   Posts: n/a Hi, Use a momentum source. Look under general sources in the documentation. Create a CEL function which calculates the pressure increase across the fan, and set the flow rate with the momentum source according to the fan curve. You can use a interpolation function to have the entire fan curve if you like. Glenn Horrocks

 April 1, 2005, 04:18 Re: how to study fans???? #3 alexis Guest   Posts: n/a thank u Glenn!! I did not be clear to explain my issue. I try to explain the problem again hi!! I'm working on a fan optimisation with the cfx571 cfd software. The fan i am studing is a part of an machine. So to optimize the fan and so the airflow throught the machine, i have to consider the pressure looses. How can i simply represent the pressure looses without represent all the geometry of the machine? -----------------------! machine with pressure ! looses due to the ! complexity of the ! connected to geometry. ! !--------------> the fan ! ! ! ! -----------------------! I would want to create thhe fan geometry into a pipe and i would want to simulate the pressure looses (that exist in the machine) at the beginning of the pipe. How can i represent these pressures looses? I know that i could impose a pressure in the inlet of the pipe. Is it the best solution?

 April 3, 2005, 18:30 Re: how to study fans???? #4 Glenn Horrocks Guest   Posts: n/a Hi, You can use a momentum source to model the pressure loss in the machine then. You might want to use a flow loss source (pressure loss proportional to velocity squared) in this case - as long as the Reynolds number is high enough. Glenn Horrocks

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post guillaume Phoenics 8 February 8, 2013 02:29 guillaume FLUENT 3 June 27, 2011 11:17 guillaume Main CFD Forum 12 June 27, 2011 11:16 Mario Main CFD Forum 0 August 24, 2009 09:59 guillaume CD-adapco 0 May 11, 2008 20:00

All times are GMT -4. The time now is 14:33.