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-   -   Problem in Spray and Combustion simulation (http://www.cfd-online.com/Forums/star-cd/123951-problem-spray-combustion-simulation.html)

John Wang September 24, 2013 22:20

Problem in Spray and Combustion simulation
 
Hi,

I am currently performing some simulations of GDI combustion. But I met problems when apply both spray model (Reitz and MIP2) and ECFM-3Z combustion model. The simulations were stopped because of either negative density or the divergence. Trimming method is adopted to get the mesh.

I would like to know the reason for the failure of the simulations. Could anyone help me about this? Thanks.

Best regards,

John

skylent October 29, 2013 06:07

check the Courant number,if it is too large, plz decrease the timestep and try again.
Quote:

Originally Posted by John Wang (Post 453406)
Hi,

I am currently performing some simulations of GDI combustion. But I met problems when apply both spray model (Reitz and MIP2) and ECFM-3Z combustion model. The simulations were stopped because of either negative density or the divergence. Trimming method is adopted to get the mesh.

I would like to know the reason for the failure of the simulations. Could anyone help me about this? Thanks.

Best regards,

John


John Wang November 8, 2013 11:11

It seems reducing the timstep could not solve this problems.
Thank you all the same.
Quote:

Originally Posted by skylent (Post 459599)
check the Courant number,if it is too large, plz decrease the timestep and try again.



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