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Forum: CFX

June 22, 2011, 19:12

Replies: 5

I really need help

Views: 1,570

Posted By ghorrocks

The time step required to resolve it may be far...

The time step required to resolve it may be far smaller than that.

But if you are getting combustion without ignition then something is not right in your physics. Better fix that first. I have no...

Forum: CFX

June 21, 2011, 20:07

Replies: 5

I really need help

Views: 1,570

Posted By ghorrocks

I have no experience in combustion modelling so...

I have no experience in combustion modelling so cannot help you with the setup, but I suspect the entire combustion event is over in 5ms. You will need a MUCH smaller timestep.

Forum: CFX

June 20, 2011, 18:45

Replies: 5

I really need help

Views: 1,570

Posted By ghorrocks

You would have to explain what you are doing...

You would have to explain what you are doing better. How big is the chamber? What is your timestep size?

I would imagine the "gradual" increase in temperature you expect to be extremely rapid if...

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