{"id":166551,"date":"2022-02-18T21:56:24","date_gmt":"2022-02-18T21:56:24","guid":{"rendered":"\/forum\/forums\/topic\/buoyancy-force\/"},"modified":"2022-03-07T09:51:28","modified_gmt":"2022-03-07T09:51:28","slug":"buoyancy-force","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/buoyancy-force\/","title":{"rendered":"buoyancy force"},"content":{"rendered":"
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Hi, I'm trying to simulate the motion of a sphere when we have gravity and buoyancy force by 6DOF and Dynamic Mesh in fluent.<\/p>\n

My Fluent settings are<\/p>\n

Density-Based<\/p>\n

Sst k-omega model<\/p>\n

Transient<\/p>\n

I have a 3d domain that contains water (density is 998.2 kg\/m3) and a sphere (radius is 1m and density is 500 kg\/m3). I set gravity -9.81 m\/s2 in y-direction. In this case, buoyancy force is greater than gravity force so the sphere ought to go up (fluent force plot shown positive value) but the sphere drops. In every time step convergence is ok(under 50 iterations). Why this happens?<\/p>\n

when I set the density of sphere 100 kg\/m3 forces to go to infinity and it's given me floating point exception error.<\/p>\n

For both cases force plot in y-direction is attached.<\/p>\n

Any help regarding this problem is highly appreciated.<\/p>\n

Regards<\/p>\n

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\nFy density of sphere = 500.jpg
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