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Search: Posts Made By: ghorrocks
Forum: CFX December 31, 2013, 07:07
Replies: 11
Views: 3,532
Posted By ghorrocks
If you are using Fluent then try the Fluent forum.

If you are using Fluent then try the Fluent forum.
Forum: CFX October 31, 2013, 05:33
Replies: 11
Views: 3,532
Posted By ghorrocks
You simply use the previous simulation as an...

You simply use the previous simulation as an initial condition for the next. This is covered by the tutorials.

But with the mass flow approach you do not need this. You can just define zero mass...
Forum: CFX October 30, 2013, 17:33
Replies: 11
Views: 3,532
Posted By ghorrocks
No, for analysis 2 you use the results from...

No, for analysis 2 you use the results from analysis 1 as initial conditions. Do not use the configuration.

If all you know about the pressure is that it is 0.85*atmospheric then can I suggest...
Forum: CFX October 29, 2013, 18:24
Replies: 11
Views: 3,532
Posted By ghorrocks
If you have the pressure then you can use a...

If you have the pressure then you can use a pressure boundary. You should at least try the massflow approach as you can usually make reasonable estimates of the massflow from the piston motion.
...
Forum: CFX October 29, 2013, 07:13
Replies: 11
Views: 3,532
Posted By ghorrocks
The pressure at the valves is generally not easy...

The pressure at the valves is generally not easy to know, but the mass flow is more easily known. That is why I recommend using a mass flow boundary, not a pressure boundary at the valves. It also...
Forum: CFX October 29, 2013, 02:00
Replies: 11
Views: 3,532
Posted By ghorrocks
What is constant V,P at the inlet? I have...

What is constant V,P at the inlet?

I have done inlet manifold modelling successfully by putting an opening at atmospheric pressure at the inlet trumpet, then using mass flow boundaries at each...
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