[GAMBIT] Ask about how to set up geometry and mesh for moving mesh case

-mAx- · December 20, 2011, 03:08

yes enable the dynamic mesh, else you cannot access to dynamic mesh zone.
But don't change anything, since your mesh will not be updated (no layering, no smoothing and no remeshing)

g-wagon · December 20, 2011, 03:13

thanks boss, really appreciate it. btw come visit my country indonesia

g-wagon · December 21, 2011, 03:10

hi max i have problem again..
i have two interface in my geometry in fluent i tried to connect them using coupled but the contour of velocity was so weird check this out

that is contour for initial solution..the wall is not rotating..but whay the fluid didnt pass the valve??

-mAx- · December 21, 2011, 03:13

yes you have problem at interfaces
Check if they are well defined.
I am in vacation untill January the 4th.

g-wagon · December 21, 2011, 03:19

but why??i think it had been defined well.. i have two surface not connected, i give that surface interface rotor and stator after that i use FLUENT to defined the interface type as coupled...

-mAx- · December 21, 2011, 03:24

no you need to define the edges as interface.
Between rotor and stator, only edges are common

g-wagon · December 21, 2011, 03:26

sorry i was wrong..i mean the edge of both stator and rotor

-mAx- · December 21, 2011, 03:28

no you mean one interface for the stator edges, and another interface for the rotor edges.
In Fluent select both interfaces to define the grid interfaces

g-wagon · December 21, 2011, 03:30

i've done that, and for the interface type i use coupled type

g-wagon · January 2, 2012, 21:13

hi max..me again hope you not bored with me

i'm facing a problem..yes again...
in my dynamic analysis using moving mesh, i'm facing the negative cell problem.. can you analysis what was wrong in my simulation, why did this comes up, here is what error like to be

-mAx- · January 4, 2012, 01:47

something is wrong since you are not suppose to change your mesh.
Check where are the negative cells

ftimis · February 3, 2012, 06:33

Hi my friend, I am currently working on a similar project. I have to design a check valve. Is that working for you? Shall I follow the steps of your discussion??

Rahul123 · September 8, 2012, 11:26

I am also plannin on using Sliding mesh to rotate a square Cylinder 2D....can ny1 help in defining interfaces.....I am not able to understand how we have two interfaces from d same circle...Do I have 2 make two circles nd define dem as interfaces

-mAx- · September 10, 2012, 00:55

imagine a surface with a hole (disk) > you are agree that in this surface you have a circle.
imagine now a disk not located on the surface mentionned earlier, but anywhere > you are agree that a circle (edge) is attached to this disk
You have then 2 circles.
Now move your disk in such way, that it will cover the hollow from first surface.
Finally you have defined a stator (first surface), and the rotor (disk) which are disconnected. And you also have 2 superposed interfaces (one belongs to stator surface and the other belongs to the rotort (disk)) Here the interfaces are the circles (edges)
I Hope I was clear

Rahul123 · September 10, 2012, 08:01

thanks max....How do I couple the two interfaces
1.coupled
2.periodic
or
3.periodic wall boundary.
I found these 3 options in fluent

-mAx- · September 10, 2012, 08:03

don't remember anymore, but coupled should be ok

December 20, 2011, 03:08		#21
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	yes enable the dynamic mesh, else you cannot access to dynamic mesh zone. But don't change anything, since your mesh will not be updated (no layering, no smoothing and no remeshing) __________________ In memory of my friend Hervé: CFD engineer & freerider

December 21, 2011, 03:13		#24
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	yes you have problem at interfaces Check if they are well defined. I am in vacation untill January the 4th. __________________ In memory of my friend Hervé: CFD engineer & freerider

December 21, 2011, 03:24		#26
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	no you need to define the edges as interface. Between rotor and stator, only edges are common __________________ In memory of my friend Hervé: CFD engineer & freerider

December 21, 2011, 03:28		#28
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	no you mean one interface for the stator edges, and another interface for the rotor edges. In Fluent select both interfaces to define the grid interfaces __________________ In memory of my friend Hervé: CFD engineer & freerider

January 4, 2012, 01:47		#31
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	something is wrong since you are not suppose to change your mesh. Check where are the negative cells __________________ In memory of my friend Hervé: CFD engineer & freerider

December 20, 2011, 03:13		#22
g-wagon Member noken Join Date: Nov 2011 Posts: 32 Rep Power: 14	thanks boss, really appreciate it. btw come visit my country indonesia

December 21, 2011, 03:10		#23
g-wagon Member noken Join Date: Nov 2011 Posts: 32 Rep Power: 14	hi max i have problem again.. i have two interface in my geometry in fluent i tried to connect them using coupled but the contour of velocity was so weird check this out that is contour for initial solution..the wall is not rotating..but whay the fluid didnt pass the valve??

December 21, 2011, 03:19		#25
g-wagon Member noken Join Date: Nov 2011 Posts: 32 Rep Power: 14	but why??i think it had been defined well.. i have two surface not connected, i give that surface interface rotor and stator after that i use FLUENT to defined the interface type as coupled...

December 21, 2011, 03:26		#27
g-wagon Member noken Join Date: Nov 2011 Posts: 32 Rep Power: 14	sorry i was wrong..i mean the edge of both stator and rotor

December 21, 2011, 03:30		#29
g-wagon Member noken Join Date: Nov 2011 Posts: 32 Rep Power: 14	i've done that, and for the interface type i use coupled type

January 2, 2012, 21:13		#30
g-wagon Member noken Join Date: Nov 2011 Posts: 32 Rep Power: 14	hi max..me again hope you not bored with me i'm facing a problem..yes again... in my dynamic analysis using moving mesh, i'm facing the negative cell problem.. can you analysis what was wrong in my simulation, why did this comes up, here is what error like to be

February 3, 2012, 06:33		#32
ftimis New Member Efthymios Efthymiou Join Date: Nov 2011 Posts: 16 Rep Power: 14	Hi my friend, I am currently working on a similar project. I have to design a check valve. Is that working for you? Shall I follow the steps of your discussion??

September 8, 2012, 11:26		#33
Rahul123 Member Satish Gupta Join Date: Jun 2012 Posts: 30 Rep Power: 13	I am also plannin on using Sliding mesh to rotate a square Cylinder 2D....can ny1 help in defining interfaces.....I am not able to understand how we have two interfaces from d same circle...Do I have 2 make two circles nd define dem as interfaces

September 10, 2012, 00:55		#34
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	imagine a surface with a hole (disk) > you are agree that in this surface you have a circle. imagine now a disk not located on the surface mentionned earlier, but anywhere > you are agree that a circle (edge) is attached to this disk You have then 2 circles. Now move your disk in such way, that it will cover the hollow from first surface. Finally you have defined a stator (first surface), and the rotor (disk) which are disconnected. And you also have 2 superposed interfaces (one belongs to stator surface and the other belongs to the rotort (disk)) Here the interfaces are the circles (edges) I Hope I was clear Marion likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

September 10, 2012, 08:01		#35
Rahul123 Member Satish Gupta Join Date: Jun 2012 Posts: 30 Rep Power: 13	thanks max....How do I couple the two interfaces 1.coupled 2.periodic or 3.periodic wall boundary. I found these 3 options in fluent

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September 10, 2012, 08:03		#36
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	don't remember anymore, but coupled should be ok __________________ In memory of my friend Hervé: CFD engineer & freerider