defining dynamic mesh

atothep · July 6, 2011, 08:36

when defining a dynamic mesh do i need to mesh the dynamic and the static part seperately and then assemble the two parts in fluent?

AdrienL · July 6, 2011, 10:25

Hi,

you don't have to mesh it separetly but you have to assign different names to the fluid zones and boundary conditions.

Adrien

atothep · July 6, 2011, 12:08

So for example a archimedes screw turning in a chamber with a small clearence must be defined with two seperate boundary conditions and then the die at the end of the screw needs to be defined seperately again? I tried using the moving frames of reference like you suggested but apparantly this is not useful when there is a clearence around the archimedes screw.

The clearence allows for clay to move backwards and form a seal within the extruder, which apparantly is another reason why the moving frame of reference won't give me the correct results.

AdrienL · July 6, 2011, 15:24

Hi,
can you draw a picture because i don't really get what you mean

atothep · July 7, 2011, 04:10

Like this only I only have to model the barrel around the archimedes screw and the die. The screw is the rotating zone and the small gap around the screw is a clearence the die is also not rotating.

Thanks

July 6, 2011, 08:36	defining dynamic mesh	#1
atothep New Member Alex Poyser Join Date: Jun 2011 Posts: 19 Rep Power: 14	when defining a dynamic mesh do i need to mesh the dynamic and the static part seperately and then assemble the two parts in fluent?

July 6, 2011, 10:25		#2
AdrienL Member Adrien Lemoine Join Date: Jun 2011 Location: Paris,France Posts: 31 Rep Power: 14	Hi, you don't have to mesh it separetly but you have to assign different names to the fluid zones and boundary conditions. Adrien __________________ ------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------

July 6, 2011, 15:24		#4
AdrienL Member Adrien Lemoine Join Date: Jun 2011 Location: Paris,France Posts: 31 Rep Power: 14	Hi, can you draw a picture because i don't really get what you mean __________________ ------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------

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July 6, 2011, 12:08		#3
atothep New Member Alex Poyser Join Date: Jun 2011 Posts: 19 Rep Power: 14	So for example a archimedes screw turning in a chamber with a small clearence must be defined with two seperate boundary conditions and then the die at the end of the screw needs to be defined seperately again? I tried using the moving frames of reference like you suggested but apparantly this is not useful when there is a clearence around the archimedes screw. The clearence allows for clay to move backwards and form a seal within the extruder, which apparantly is another reason why the moving frame of reference won't give me the correct results.

July 7, 2011, 04:10		#5
atothep New Member Alex Poyser Join Date: Jun 2011 Posts: 19 Rep Power: 14	Like this only I only have to model the barrel around the archimedes screw and the die. The screw is the rotating zone and the small gap around the screw is a clearence the die is also not rotating. Thanks