Problem Using Algebraic Slip Model (ASM)

safikhani_hamed · September 20, 2012, 03:48

Dear friends,
I am modeling a gas-solid twophase flow using ASM , in fact in my simulations the solid particles drop at the bottom of pipe very soon and it is clear that the simulation is not correct because when I change the solid density or solid diameter, the simulation does not change , please help me what is the problem ?

sincerely

ghorrocks · September 20, 2012, 07:29

Are you sure you implemented the different density and diameter correctly? Are you in a flow regime where it is not sensitive to diameter or density? Is your simulation fully converged? Are you interpreting the results correctly?

safikhani_hamed · September 20, 2012, 15:46

Dear friend,
In fact yes the simulation is fully converged, but I do not why suddenly the solid particles drop to the bottom of the pipe. Is there any tutorial about ASM model ?

sincerely

ghorrocks · September 24, 2012, 21:56

You could be in a regime where the density and diameter does nto make much difference, you have to do much larger changes to have an effect.

September 20, 2012, 03:48	Problem Using Algebraic Slip Model (ASM)	#1
safikhani_hamed Member Hamed Join Date: Oct 2009 Posts: 64 Rep Power: 16	Dear friends, I am modeling a gas-solid twophase flow using ASM , in fact in my simulations the solid particles drop at the bottom of pipe very soon and it is clear that the simulation is not correct because when I change the solid density or solid diameter, the simulation does not change , please help me what is the problem ? sincerely

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September 20, 2012, 07:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,699 Rep Power: 143	Are you sure you implemented the different density and diameter correctly? Are you in a flow regime where it is not sensitive to diameter or density? Is your simulation fully converged? Are you interpreting the results correctly?

September 20, 2012, 15:46		#3
safikhani_hamed Member Hamed Join Date: Oct 2009 Posts: 64 Rep Power: 16	Dear friend, In fact yes the simulation is fully converged, but I do not why suddenly the solid particles drop to the bottom of the pipe. Is there any tutorial about ASM model ? sincerely

September 24, 2012, 21:56		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,699 Rep Power: 143	You could be in a regime where the density and diameter does nto make much difference, you have to do much larger changes to have an effect.