Forum: CFX
February 5, 2014, 17:52
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Replies: 84
Views: 24,619
Actually, on second thoughts you cannot do...
Actually, on second thoughts you cannot do momentum sources with source points. Looks like only mass and energy sources an that means you are creating or destroying mass or energy. My understanding...
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Forum: CFX
February 4, 2014, 18:20
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Replies: 84
Views: 24,619
Good. Now we have a good starting point.
...
Good. Now we have a good starting point.
The thermal model will be more stable so I would start with that. But a fire will result in temperature differences big enough that a compressible...
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Forum: CFX
February 3, 2014, 17:12
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Replies: 84
Views: 24,619
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Forum: CFX
February 2, 2014, 17:36
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Replies: 84
Views: 24,619
I cannot count the number of times people have...
I cannot count the number of times people have started by modelling the most complex model they can imagine and got nowhere and then had no results to show for all the work. Surely a better approach...
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Forum: CFX
November 25, 2013, 01:00
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Replies: 84
Views: 24,619
It depends on what you want to model the...
It depends on what you want to model the sprinklers for.
If you simply want their cooling effect then put a heat sink where they act. Simple (but very approximate).
If you want to see where the...
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Forum: CFX
November 21, 2013, 05:15
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Replies: 84
Views: 24,619
The most important thing is to define boundary...
The most important thing is to define boundary conditions which match the situation you are trying to simulate. I see from your first post you have some inlets and outlets - but what defines the flow...
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Forum: CFX
November 19, 2013, 05:02
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Replies: 84
Views: 24,619
There is an FAQ on accuracy:...
There is an FAQ on accuracy: http://www.cfd-online.com/Wiki/Ansys_FAQ#Why_are_my_results_inaccurate.3F
In this case I doubt you will find the assumption of steady state appropriate. Highly buoyant...
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Forum: CFX
November 17, 2013, 18:21
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Replies: 84
Views: 24,619
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Forum: CFX
November 17, 2013, 17:04
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Replies: 84
Views: 24,619
The CFX documentation has important comments on...
The CFX documentation has important comments on boundary condition selection. If you select velocity inlet and outlet then the pressure level is not set and the simulation is badly posed. You need to...
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Forum: CFX
November 14, 2013, 17:37
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Replies: 84
Views: 24,619
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Forum: CFX
November 13, 2013, 19:58
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Replies: 84
Views: 24,619
The concept is simple (I should write a FAQ on...
The concept is simple (I should write a FAQ on this):
* Make the mesh significantly finer. Halving the element edge length is what you should aim for. This will make your mesh something like 8...
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Forum: CFX
November 13, 2013, 17:42
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Replies: 84
Views: 24,619
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Forum: CFX
November 5, 2013, 18:14
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Replies: 84
Views: 24,619
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Forum: CFX
November 4, 2013, 19:35
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Replies: 84
Views: 24,619
You can use if statements: ...
You can use if statements:
if(t<800[s],if(t<180[s],{function for 0-180s},{function for 180-800s}),{function for >800s})
I do not understand your second question. Your step function concept is the...
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Forum: CFX
October 22, 2013, 21:18
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Replies: 84
Views: 24,619
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Forum: CFX
October 15, 2013, 20:39
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Replies: 84
Views: 24,619
I would not worry about the domains until you...
I would not worry about the domains until you have fixed the weird inlet. You are going to get all sorts of grief from that. If the method you are usign the generate the volume is not working then...
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Forum: CFX
October 14, 2013, 18:31
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Replies: 84
Views: 24,619
First of all, something weird has happened at...
First of all, something weird has happened at your inlet door thing. You will need to fix that up before proceeding.
How to set up solid/fluid simulations is covered in the tutorials - have a look...
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Forum: CFX
September 17, 2013, 08:52
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Replies: 84
Views: 24,619
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Forum: CFX
September 17, 2013, 08:10
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Replies: 84
Views: 24,619
Look in the CFX reference manual for the...
Look in the CFX reference manual for the definition of CEL expressions.
step is simply a function which if the argument is negative it returns 0, if positive it returns 1 and if precisely zero it...
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Forum: CFX
September 16, 2013, 19:05
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Replies: 84
Views: 24,619
The error message means exactly what it says -...
The error message means exactly what it says - you have referenced a object called "Floor" but no appropriate object exists. You need to change the name you are referencing or fix your mesh to have...
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Forum: CFX
September 12, 2013, 07:47
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Replies: 84
Views: 24,619
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Forum: CFX
September 11, 2013, 19:38
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Replies: 84
Views: 24,619
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