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Forum: OpenFOAM Running, Solving & CFD

June 30, 2009, 08:17

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,808

Posted By yuhai

Thanks Alberto. Pls let me know if you have any...

Thanks Alberto. Pls let me know if you have any new ideas.

Forum: OpenFOAM Running, Solving & CFD

June 28, 2009, 20:18

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,808

Posted By yuhai

thanks, Alberto I have tried upwind, but I...

thanks, Alberto
I have tried upwind, but I don't think that can let OpenFOAM exceed the maxCo=1, in my case, 0.00005 means maxCo about 0.15-0.3, and the setting 0.005 in fluent means maxCo more...

Forum: OpenFOAM Running, Solving & CFD

June 28, 2009, 08:10

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,808

Posted By yuhai

Thanks for the hints, Alberto. ...

Thanks for the hints, Alberto.
---------------------------------------------
ddtSchemes
{
default Euler;
}
gradSchemes
{
default Gauss linear;
grad(p) Gauss...

Forum: OpenFOAM Running, Solving & CFD

June 27, 2009, 12:00

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,808

Posted By yuhai

As I have said, the result of Fluent with deltaT...

As I have said, the result of Fluent with deltaT 0,005 could already give a good fit with experiment result.
Well, for OpenFOAM, stability needs 0.0001, and a good result needs 0,00005.

My...

Forum: OpenFOAM Running, Solving & CFD

June 27, 2009, 08:35

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,808

Posted By yuhai

User's GUide Chapter 8.9.2: Time Step Size: The...

User's GUide Chapter 8.9.2:
Time Step Size: The time step size is the magnitude of http://venus.imp.mx/hilario/SuperComputo/Fluent.Inc/manuals/fluent5/ug/html/img1287.gif. Since the FLUENT...

Forum: OpenFOAM Running, Solving & CFD

June 26, 2009, 13:54

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,808

Posted By yuhai

How can deltaT exceed the limitation of courant?

Hi, All foamers,
In OF Users Guide, the selection of deltaT is depend on courant.
I follows this rule, and set my deltaT to under 0.00005, this works fine on turbDyMFoam.

but there seems no...

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