Mystic error in FLUENT Solution initializtion

Abhya · March 27, 2013, 09:50

Hi .. I created the attached geometry mode in GAMBIT and exported it in ".msh" format.
I first created the geometry as is in the pic below (Only the part above the axis .. its an axisymmetric case)

it worked 100% right....got the results....

2nd time I tried it constructing in the vertical orientation as shown below:

I gave the same BCs .. axial vel etc ..but got the following weird symbols in the initialization :

I tried to initialize manually by putting the inlet value in the initialization boxes.. but it gives "Divergence detected in AMG solver .. (for all equations if i try to change the cycle type and stability method in solutions - advanced options"

(Its v imp for my project ... after having worked so much and coming to the end of writing a huge UDF for vertical case i have come across this error! . NOTE : no udf was loaded in the above case i mentioned..its later part

oj.bulmer · March 27, 2013, 09:56

Can't see the images!

OJ

chaosh · March 27, 2013, 15:15

Axisymmetry only works in fluent when the axis of symmetry is the x-axis.

Abhya · March 28, 2013, 07:24

sry fixed the image links!
@chaosh
Thanks a lot mate! .. can I know how did u come to know about that? If im not wrong.its nowhere in the manual!
I really wonder why FLUENT COULD HAVE SUCH A RESTRICTION/FLAW!

oj.bulmer · March 28, 2013, 07:43

It is very well documented in FLUENT documentation:

// User's Guide :: 2 // 5. Reading and Manipulating Meshes // 5.2. Mesh Requirements and Considerations // 5.2.1. Geometry/Mesh Requirements

"Axisymmetric geometries must be defined such that the axis of rotation is the x axis of the Cartesian coordinates used to define the geometry"

OJ

chaosh · March 28, 2013, 13:32

What OJ said

March 27, 2013, 09:50	Mystic error in FLUENT Solution initializtion	#1
Abhya Member Join Date: Jul 2012 Posts: 48 Rep Power: 13	Hi .. I created the attached geometry mode in GAMBIT and exported it in ".msh" format. I first created the geometry as is in the pic below (Only the part above the axis .. its an axisymmetric case) it worked 100% right....got the results.... 2nd time I tried it constructing in the vertical orientation as shown below: I gave the same BCs .. axial vel etc ..but got the following weird symbols in the initialization : I tried to initialize manually by putting the inlet value in the initialization boxes.. but it gives "Divergence detected in AMG solver .. (for all equations if i try to change the cycle type and stability method in solutions - advanced options" (Its v imp for my project ... after having worked so much and coming to the end of writing a huge UDF for vertical case i have come across this error! . NOTE : no udf was loaded in the above case i mentioned..its later part Last edited by Abhya; March 28, 2013 at 07:19.

March 27, 2013, 15:15	Axis	#3
chaosh New Member sp Join Date: Jul 2011 Posts: 23 Rep Power: 14	Axisymmetry only works in fluent when the axis of symmetry is the x-axis. Abhya likes this.

March 28, 2013, 07:43		#5
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	It is very well documented in FLUENT documentation: // User's Guide :: 2 // 5. Reading and Manipulating Meshes // 5.2. Mesh Requirements and Considerations // 5.2.1. Geometry/Mesh Requirements "Axisymmetric geometries must be defined such that the axis of rotation is the x axis of the Cartesian coordinates used to define the geometry" OJ Abhya likes this.

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March 27, 2013, 09:56		#2
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	Can't see the images! OJ

March 28, 2013, 07:24		#4
Abhya Member Join Date: Jul 2012 Posts: 48 Rep Power: 13	sry fixed the image links! @chaosh Thanks a lot mate! .. can I know how did u come to know about that? If im not wrong.its nowhere in the manual! I really wonder why FLUENT COULD HAVE SUCH A RESTRICTION/FLAW!

March 28, 2013, 13:32		#6
chaosh New Member sp Join Date: Jul 2011 Posts: 23 Rep Power: 14	What OJ said