Field Function shows an error

niazaliahmed · September 23, 2011, 02:42

I am trying to write a vector field function to calculate 17/(Velocity^2)

I have tried

17/(pow($$Velocity,2))
17/($$Velocity*$$Velocity)

Both have failed. Is this because vector division is not possible, or some other error?

However when I use a single dollar Velocity it shows assembly code.

Please help me asap.

jfcorbett · September 23, 2011, 04:12

There is no such thing as vector division.

I'm guessing you want to divide by the magnitude of the velocity vector? STAR-CCM+ provides two ways to calculate the magnitude of a vector:

vector magnitude: mag($$u)
vector magnitude squared: mag2($$u)

So for you, the most straightforward expression is: 17/mag2($$Velocity)

For more, see STAR-CCM+ help:
Using Tools > Using Field Functions > Field Function Programming Reference > Vector Functions

niazaliahmed · September 23, 2011, 08:17

@jfcorbett
Thank you very much. The problem is solved now.

September 23, 2011, 02:42	Field Function shows an error	#1
niazaliahmed New Member Niaz Ali Ahmed Join Date: Jun 2010 Posts: 13 Rep Power: 5	I am trying to write a vector field function to calculate 17/(Velocity^2) I have tried 17/(pow($$Velocity,2)) 17/($$Velocity*$$Velocity) Both have failed. Is this because vector division is not possible, or some other error? However when I use a single dollar Velocity it shows assembly code. Please help me asap.

September 23, 2011, 04:12		#2
jfcorbett New Member Jean-François Corbett Join Date: Aug 2011 Posts: 8 Rep Power: 3	There is no such thing as vector division. I'm guessing you want to divide by the magnitude of the velocity vector? STAR-CCM+ provides two ways to calculate the magnitude of a vector: vector magnitude: mag($$u) vector magnitude squared: mag2($$u) So for you, the most straightforward expression is: 17/mag2($$Velocity) For more, see STAR-CCM+ help: Using Tools > Using Field Functions > Field Function Programming Reference > Vector Functions siara817 likes this.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
GroovyBC the dynamic cousin of funkySetFields that lives on the suburb of the mesh	gschaider	OpenFOAM	284	April 8, 2013 09:19
polynomial thermophysical properties II	sebastian	OpenFOAM Running, Solving & CFD	49	August 1, 2011 03:38
How to install CGNS under windows xp?	lzgwhy	Main CFD Forum	1	January 11, 2011 18:44
checking the system setup and Qt version	vivek070176	OpenFOAM Installation	22	June 1, 2010 12:34
groovyBC	sega	OpenFOAM Running, Solving & CFD	12	February 17, 2010 09:30

September 23, 2011, 08:17		#3
niazaliahmed New Member Niaz Ali Ahmed Join Date: Jun 2010 Posts: 13 Rep Power: 5	@jfcorbett Thank you very much. The problem is solved now.