How to give Buoyancy and drag force for a particle in dpm

krishna.n · May 23, 2016, 09:13

hi,
Iam using particle tracking to know how many particles are trapped. for this i have to give buoyancy and drag force for particle. But i cannot find these forces in fluent dpm. can any one tell me where can i activate these forces?

Regards,
Krishna.

`e` · May 23, 2016, 18:34

Buoyancy is affected by the gravity and is included by default when gravity is enabled. The drag force law can be specified in the discrete phase model under injections.

krishna.n · May 24, 2016, 02:16

Thank You for the reply.
These are the only forces I can activate in dpm.
Staffman lift force, Virtual mass force,Pressure gradient force. which one to choose?

`e` · May 24, 2016, 03:31

Choose your drag law of the particles in DPM via: Discrete Phase Model > Injections... > injection-0 > Physical Models > Drag Law. Use Stokes-Cunningham for submicron particles, otherwise the spherical drag law (default) is probably appropriate.

May 23, 2016, 09:13	How to give Buoyancy and drag force for a particle in dpm	#1
krishna.n New Member KcN Join Date: Apr 2016 Posts: 13 Rep Power: 10	hi, Iam using particle tracking to know how many particles are trapped. for this i have to give buoyancy and drag force for particle. But i cannot find these forces in fluent dpm. can any one tell me where can i activate these forces? Regards, Krishna.

May 24, 2016, 03:31		#4
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Choose your drag law of the particles in DPM via: Discrete Phase Model > Injections... > injection-0 > Physical Models > Drag Law. Use Stokes-Cunningham for submicron particles, otherwise the spherical drag law (default) is probably appropriate. wc34071209 likes this.

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May 23, 2016, 18:34		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Buoyancy is affected by the gravity and is included by default when gravity is enabled. The drag force law can be specified in the discrete phase model under injections.

May 24, 2016, 02:16		#3
krishna.n New Member KcN Join Date: Apr 2016 Posts: 13 Rep Power: 10	Thank You for the reply. These are the only forces I can activate in dpm. Staffman lift force, Virtual mass force,Pressure gradient force. which one to choose?