How is the drag coefficient determined?

Shinichiro_Oshiro

Hi.

I would like to add particle body force in EDEM and simulate movement due to drag.

There are four models of drag coefficient (Schiller and Naumann, Morsi and Alexander, Haider & Levenspiel, Ganser), but I would like to know how the drag coefficient is determined internally.
If you have any documents, could you please share them?

Also, is there a way to give a constant drag coefficient regardless of the Re number or other conditions?

Best Regards,

jerrinjobs

Hi Shinichiro

Please check https://help.altair.com/edem/Bibliography.htm. If you scroll down to 'Lift and Drag Models', there are references of where the equations are taken.

To give a constant drag coefficient, you will have to use API within EDEM to do it. You can take a look at this reference, and modify it a bit to use constant drag: https://community.altair.com/community/en/edem-api-particle-body-force-field-data-coupling-choice-of-drag-models-with?id=kb_article&sysparm_article=KB0122101

Hope this helps.

Thanks,
Jerrin Job

Shinichiro_Oshiro

Hi Jerrin

Thank you for your answer

I don't have those documents and it would take some time to refer to them, so if you know them, could you please write down the formulas?
It's okay if you don't know.

 

I have never edited the API, but I will give it a try.

 

Best Regards,

Shinichiro