write an expression

Cecco · June 19, 2012, 02:52

Hi guys,
I have to write an expression which takes in account the rotational speed of an impeller from 0 to 6000 RPM.
Can someone help me?

lffabiani · June 19, 2012, 08:49

Francesco,

Can you send the expression? Does the speed changes with time?

Cecco · June 19, 2012, 10:05

The point is that I've never write an expression before and I have no idea how to do.
It's something within step(Accumulated time step + ...).
I just need a way to reach 6000RPM from 0.

lffabiani · June 19, 2012, 16:59

The CFX tutorials are a good place to start. Maybe you should do some simple expresions to get the hang of it. Then move to the more advanced stuff.

June 19, 2012, 02:52	write an expression	#1
Cecco Member Francesco Join Date: Jan 2012 Posts: 31 Rep Power: 14	Hi guys, I have to write an expression which takes in account the rotational speed of an impeller from 0 to 6000 RPM. Can someone help me?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mesh file for flow over a circular cylinder	Ardalan	Main CFD Forum	7	December 15, 2020 13:06
How to install CGNS under windows xp?	lzgwhy	Main CFD Forum	1	January 11, 2011 18:44
CGNS lib and Fortran compiler	manaliac	Main CFD Forum	2	November 29, 2010 06:25
how to write an expression for temperature gradien	bilal	CFX	2	October 20, 2008 16:48
Lift, Drag Vs time chart,calculations	Jamesd69climber	CFX	8	February 17, 2005 17:23

June 19, 2012, 08:49		#2
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	Francesco, Can you send the expression? Does the speed changes with time?

June 19, 2012, 10:05		#3
Cecco Member Francesco Join Date: Jan 2012 Posts: 31 Rep Power: 14	The point is that I've never write an expression before and I have no idea how to do. It's something within step(Accumulated time step + ...). I just need a way to reach 6000RPM from 0.

June 19, 2012, 16:59		#4
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	The CFX tutorials are a good place to start. Maybe you should do some simple expresions to get the hang of it. Then move to the more advanced stuff.