starcd 3.24 has bugs?
 

I did a transient simulation of the exhaust system of engine by starcd 3.24, the negative density appeared when the first step was over.The time step is 2.7778e-5,the engine speed is 6000rpm,the mesh is all hexa by ICEMCFD.There's no effect on convergence by adjusting the relaxation factor and pressure correcter factor,I have no idea of changing the situation. But a strange sign occured when i used the star cd 3.15 for the simulation, the negative density disappeared, i don't know why?

Re: starcd 3.24 has bugs?
 

Try upgrading to the the latest verion (3.26 or 4.06) 3.24 is a few years old now

Re: starcd 3.24 has bugs?
 

The problem also exist when i use starcd 3.26.

Re: starcd 3.24 has bugs?
 

"switch 60 on"

Re: starcd 3.24 has bugs?
 

"switch 60 on" ,wha't the mean?

Re: starcd 3.24 has bugs?
 

Just enter the command into prostar an see if it works.

Re: starcd 3.24 has bugs?
 

switch on 60,it doesn't work.