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-   -   calculation of drag force for a bubble (https://www.cfd-online.com/Forums/openfoam-post-processing/198578-calculation-drag-force-bubble.html)

alimea February 11, 2018 08:19
calculation of drag force for a bubble
 
Hi every body
I want to calculate drag coefficient that is applied to a bubble which arises in a liquid. You know that forceCoeff code is for a boundary patch.

Thanks

cyw August 30, 2019 06:26
Quote:
Originally Posted by alimea (Post 681147)
Hi every body
I want to calculate drag coefficient that is applied to a bubble which arises in a liquid. You know that forceCoeff code is for a boundary patch.

Thanks
Have you solved this problem? Thank you!

alimea August 30, 2019 12:21
Quote:
Originally Posted by cyw (Post 743462)
Have you solved this problem? Thank you!
According to my searches, drag should be calculated using force balance on bubble.

regards

cyw August 30, 2019 15:46
Quote:
Originally Posted by alimea (Post 743489)
According to my searches, drag should be calculated using force balance on bubble.

regards
Thank you for your message. Could you tell me more? Which forces are in balance?

alimea August 31, 2019 02:34
Quote:
Originally Posted by cyw (Post 743498)
Thank you for your message. Could you tell me more? Which forces are in balance?
You can find the Terminal velocity of the bubble using the balance of all of the forces applied to it, such as gravity, buoyancy, drag ,... . Finally the drag force can be found with Terminal velocity.

Regards


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