Learning Forum

[ilker.kurtoglu]

Dear All,

I am trying to calculate the drag coefficient of a specific object around Mach number of 0.5-0.7.

How can I use the gauge pressure in CESE solver to obtain drag coefficient only with the dynamic pressure?

Regards

İlker

[Pedram Samadian]

Hi İlker,

I'll check this with the developer and then get back to you.

Regards,

Pedram

 

[Pedram Samadian]

Hi İlker,

Here is the response from the developer:

"First, the concept of "gauge pressure" is not something that is used in the context of the CESE or DualCESE solvers.  It comes from incompressible-type solvers that are adjusted to compute weakly compressible solutions, for instance, in Fluent.

Second, the tools for computing drag in the CESE solver are not very good.

 

Third, we are encouraging users to no longer use the CESE solver, and to switch to the DualCESE solver.  In the DualCESE solver, the drag-related computations are much more advanced.

 

For that purpose, look in Vol. III of the LS-DYNA keyword manual to find:  *DUALCESE_DATABASE_HISTORY_DRAG_LIFT"

I hope this information is useful. Please let me know if you have any questions.

Thanks,

Pedram

[ilker.kurtoglu]

Dear Pedram,

Thanks for your response.

I looked at that keyword in DualCESE solver and it seems useful. However, there are little explanation about how it is working. Do you have a more detailed document about this keyword?

Best regards,

İlker

[Pedram Samadian]

Hi İlker,

You just need to add this keyword (DUALCESE_DATABASE_HISTORY_DRAG_LIFT) to your input deck and run the model. All drag and lift-related data are then stored in the binout file, which can be loaded in LS-PrePost.

Please let me know if you have any questions.

Best regards,

Pedram