why the inlet velocity magnitude differrent from the value i initialize?

Touré · August 27, 2012, 10:38

I can't see the xyz coordinates of the second image from FLUENT. It's not clear because it's too small.

hhh · August 28, 2012, 02:56

dear toure, please find the attached fluent image2

Touré · August 28, 2012, 07:12

Nothing has changed except the view. You can change the view at Display -> View or use the mouse to turn it.

hhh · August 28, 2012, 09:44

Dear toure, thanks for kind response

1)In gambit & fluent both are default x is right, y is up & z is horizontal, according to my problem, For my actual geometry purpose, i select coordinates is x is towards right, y is horizontal & z is downwards if i choose default x is right, y is up & z is horizontal in gambit my wing looks up, but actual geometry my wing looks bottom thats why i choose coordinates is x is towards right, y is horizontal & z is downwards in gambit i didn't select default.

2) After i import in fluent, its take default coordinates in fluent, it will not change according to gambit coordinates, how i can change my coordinates in fluent according to my gambit coordinates? that's is my doubt. what i feel is In fluent may be some -/+ sign problem will occur in boundary condition or other condition like velocity inlet due to this coordinates.

3) If both gambit&fluent default coordinates means its okay.

4) if u didn't understand you take any 3D problem change coordinates(ie different view in gambit) and do your meshing in gambit, then see in fluent how the xyz coordinates changing.It will not give same coordinates in fluent as in gambit. please help me

Touré · August 30, 2012, 19:55

I am not familiar to Gambit but the change of view doesn't have any effects on the coordinates. If you have any point A of coordinates (xA, yA, zA) you flip it in Gambit or Fluent, it will still the same A(xA, yA, zA). You can check the dimensions of the domain in FLUENT (Mesh -> Scale).

hhh · August 31, 2012, 03:30

Dear toure,
thanks a lot for giving your kind response for my queries.

sanjeetlimbu · April 20, 2015, 22:34

Dear sir

I am trying to compress the fluid inside the cylider as 2D axi-symetric partially premixed model
I am not getting pressure rise... infact pressure initially very low may be not sufficient fuel mixture...
Can u tell how to input the mass / or quantity for cell-zone type

August 28, 2012, 09:44	coordinates in gambit&fluent	#24
hhh Senior Member kunar Join Date: Nov 2011 Posts: 117 Rep Power: 15	Dear toure, thanks for kind response 1)In gambit & fluent both are default x is right, y is up & z is horizontal, according to my problem, For my actual geometry purpose, i select coordinates is x is towards right, y is horizontal & z is downwards if i choose default x is right, y is up & z is horizontal in gambit my wing looks up, but actual geometry my wing looks bottom thats why i choose coordinates is x is towards right, y is horizontal & z is downwards in gambit i didn't select default. 2) After i import in fluent, its take default coordinates in fluent, it will not change according to gambit coordinates, how i can change my coordinates in fluent according to my gambit coordinates? that's is my doubt. what i feel is In fluent may be some -/+ sign problem will occur in boundary condition or other condition like velocity inlet due to this coordinates. 3) If both gambit&fluent default coordinates means its okay. 4) if u didn't understand you take any 3D problem change coordinates(ie different view in gambit) and do your meshing in gambit, then see in fluent how the xyz coordinates changing.It will not give same coordinates in fluent as in gambit. please help me

August 31, 2012, 03:30	coordinates in gambit&fluent	#26
hhh Senior Member kunar Join Date: Nov 2011 Posts: 117 Rep Power: 15	Dear toure, thanks a lot for giving your kind response for my queries.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
unsteady inlet velocity udf	jill	FLUENT	8	February 10, 2015 07:04
velocity inlet vs pressure inlet	cheong	FLUENT	6	April 9, 2011 04:07
pressure with velocity inlet boundary conditions	Ashraf Sharara	FLUENT	1	August 21, 2008 08:29
UDF problem : inlet velocity in cyl. coord. system	Jongdae Kim	FLUENT	0	June 15, 2004 12:21
How to improve Velocity magnitude	ravi	FLUENT	0	June 23, 2003 14:17

August 27, 2012, 10:38		#21
Touré Member Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 16	I can't see the xyz coordinates of the second image from FLUENT. It's not clear because it's too small.

August 28, 2012, 07:12		#23
Touré Member Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 16	Nothing has changed except the view. You can change the view at Display -> View or use the mouse to turn it.

August 30, 2012, 19:55		#25
Touré Member Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 16	I am not familiar to Gambit but the change of view doesn't have any effects on the coordinates. If you have any point A of coordinates (xA, yA, zA) you flip it in Gambit or Fluent, it will still the same A(xA, yA, zA). You can check the dimensions of the domain in FLUENT (Mesh -> Scale).