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Posts Made By:
ghorrocks
Forum:
CFX
April 18, 2013, 07:29
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
I think you will find that specifying the...
I think you will find that specifying the pressure rise and flow rate is over-specifying the flow. You specify either the pressure rise or the flow rate but not both. You can even specify the...
Forum:
CFX
March 16, 2013, 05:59
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
The documentation describes source terms and...
The documentation describes source terms and source term coefficients pretty well.
Forum:
CFX
August 25, 2012, 09:04
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
So instead you put them into a monitor point and...
So instead you put them into a monitor point and can watch them as the simulation progresses. Of course, you could always manually calculate the pressure at the inlet and outlet and work out what...
Forum:
CFX
August 25, 2012, 07:31
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
Correct. As for your units problem: You...
Correct.
As for your units problem:
You set the constant C (which appears to have become 1 in your equation in post #17 - this should be a number large compared to the velocities in your...
Forum:
CFX
August 24, 2012, 08:36
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
No, that is not the source term coefficient. That...
No, that is not the source term coefficient. That is just the source term equation. The source term coefficient is the derivative of the source term WRT the variable controlling it (U in this case)....
Forum:
CFX
August 23, 2012, 19:56
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
You obviously need to fix up the naming problems,...
You obviously need to fix up the naming problems, and possibly generate new regions in your mesh so you can identify mesh regions.
Also, have you specified a source term coefficient? That will...
Forum:
CFX
August 23, 2012, 09:07
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
You can make the pressure of your boundary...
You can make the pressure of your boundary condition a function of the mass flow rate and ge the fan curve on this boundary as well, if you like. It can also be done by setting the mass flow rate...
Forum:
CFX
June 2, 2011, 20:19
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
Are you using a source term coefficient? They...
Are you using a source term coefficient? They help convergence.
Forum:
CFX
June 1, 2011, 08:12
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
Your sum(Pressure) functions will lead to weird...
Your sum(Pressure) functions will lead to weird results. The sum function adds the value at each node in the region. This is not meaningful for what you are doing. You should use the...
Forum:
CFX
May 31, 2011, 09:33
Replies:
28
Simulation of Axial Fan Flow using A Momentum Source Subdomain
Views:
18,137
Posted By
ghorrocks
Q1 - If defining an initial velocity does not...
Q1 - If defining an initial velocity does not work then modify your expressions using an if or step function so it gives a sensible valve at zero flow. Sensible does not mean realistic, it just means...
Showing results 1 to 10 of 10
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