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Search: Posts Made By: ghorrocks
Forum: CFX July 15, 2014, 07:02
Replies: 21
Views: 5,062
Posted By ghorrocks
Have you done the CFX tutorials? They show you...

Have you done the CFX tutorials? They show you the basics.
Forum: CFX May 9, 2013, 19:06
Replies: 21
Views: 5,062
Posted By ghorrocks
I was starting to suspect that :) But do not...

I was starting to suspect that :)

But do not go to the full model yet. On this simple compression of a gas in a cylinder model use it to compare against analytical equations on isentropic gas...
Forum: CFX May 9, 2013, 00:34
Replies: 21
Views: 5,062
Posted By ghorrocks
Yes, remove the ports and interfaces. Just have a...

Yes, remove the ports and interfaces. Just have a sealed blob of gas above and below the piston which you compress. This is a worthwhile validation check (against adiabatic compression curves) to...
Forum: CFX May 8, 2013, 23:31
Replies: 21
Views: 5,062
Posted By ghorrocks
Good, now the mesh is working. Now to get it...

Good, now the mesh is working.

Now to get it converging. I would do a simple model with just the cylinder. So remove the inlet and exhaust port. Does that run? This has to be able to run before...
Forum: CFX May 7, 2013, 20:39
Replies: 21
Views: 5,062
Posted By ghorrocks
This is the expected error - I have done zillions...

This is the expected error - I have done zillions of engine models and have seen them all before :) (ps: you might be interested to see my PhD thesis: http://hdl.handle.net/2100/248)

Split the...
Forum: CFX May 7, 2013, 01:34
Replies: 21
Views: 5,062
Posted By ghorrocks
Have you checked the mesh motion is behaving...

Have you checked the mesh motion is behaving itself?

Do a simulation where you save a results file every time step with the mesh. Using expert parameters turn the fluids, thermal, turbulence and...
Forum: CFX May 5, 2013, 08:58
Replies: 21
Views: 5,062
Posted By ghorrocks
It is best to make this model a 2 or a 3 domain...

It is best to make this model a 2 or a 3 domain model. 1 domain is the cylinder and contains all the moving mesh, and 1 domain contains the stationary bits and does not have a moving mesh model....
Forum: CFX May 3, 2013, 04:05
Replies: 21
Views: 5,062
Posted By ghorrocks
You can't define the inlet as a 2m/s inlet. Where...

You can't define the inlet as a 2m/s inlet. Where is the air going to go when the port is closed? It has to be a pressure opening.

You will need to put the proper motion on your piston. Use a sin...
Forum: CFX May 2, 2013, 19:42
Replies: 21
Views: 5,062
Posted By ghorrocks
It depends on what you are trying to model. If...

It depends on what you are trying to model. If you are trying to model blowby and piston sealing then use 1 (but you will need to include the piston rings). If you are ignoring blowby then use 2. For...
Forum: CFX May 2, 2013, 07:56
Replies: 21
Views: 5,062
Posted By ghorrocks
Yes, you should be able to do this without...

Yes, you should be able to do this without remeshing. You just need to put GGIs in the right spots. Make the side walls of the upper cylinder (above the piston) and crank case GGIs and let them slide...
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