|
[Sponsors] |
August 2, 2012, 04:47 |
Fluent
|
#1 |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Hi all,
i have a simple question. i created a cylinder in ansys modeling. then i sliced it in 4 parts. i meshed all parts.(conformal mesh) i used named selection for inlet and outlet(FIG.1). when i import mesh to fluent, there are 8 walls!!(FIG.2.) my question is, how the wall is created??? and please tell me, why the walls can not be displayed in fluent(FIG.2.)? what should i do? i don not want to have walls???? and how can i convert the walls to interior(FIG.3.)? |
|
August 2, 2012, 04:56 |
|
#2 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
Rep Power: 15 |
Hi,
i think it happened because your fractions of fluid should be in the same part: in Design Modeler select all of them ---> right-click ----> FORM NEW PART. Otherwise, in your actual situation, you have to create coupled wall between each part
__________________
Bionico |
|
August 2, 2012, 05:15 |
|
#3 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,400
Rep Power: 47 |
Why did you split the pipe like this?
The elements in the center of the pipe have a very low quality. I suggest you use an O-Grid instead. |
|
August 2, 2012, 05:39 |
|
#4 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
you right. but the center mesh is not important for me. any way, my question is why there all walls in fluent???? |
||
August 2, 2012, 05:42 |
|
#5 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
i formed new part. but the mesh changed!!!!!!!!! i want to have the first mesh. |
||
August 2, 2012, 05:46 |
|
#6 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,400
Rep Power: 47 |
Bionico already gave the correct answer to this.
Although you may not be interested in what happens at the center of the pipe, the whole flow field depends on the result here. |
|
August 2, 2012, 05:56 |
|
#7 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
Rep Power: 15 |
In the last picture I see that the zone near the circumference has a different colour, and in the Geometry there's a solid and a fluid zone... in the first picture there was only fluid, are you sure you haven't changed anything in the design modeler?
__________________
Bionico |
|
August 2, 2012, 06:07 |
|
#8 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
i made mistake. below is the correct picture. |
||
August 2, 2012, 06:09 |
|
#9 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
i know that the center part is very important. but my question is about slice tool in design modeler, i mean when i slice different body for generating hexa mesh, in fluent there will be walls???? why??? |
||
August 2, 2012, 06:22 |
|
#10 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,400
Rep Power: 47 |
Because when you slice one part, you get two parts. The surface between the two new parts is treated as a wall. I cant think of an answer to the question "why?". It has to be one of the two, interface or wall.
If you do not want this surface to be treated as a wall, freeze the part before slicing and "form new part" from the two parts after slicing. Or switch the boundary condition from "wall" to "internal" in fluent. |
|
August 2, 2012, 06:30 |
|
#11 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
Rep Power: 15 |
As flotus and I (in the first answer) said, you should put all the parts in one (then you can even rename each of the sub-part). Otherwise fluent create walls and you have to define them in MESH INTERFACE
__________________
Bionico |
|
August 2, 2012, 06:32 |
|
#12 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
also if i use FORM NEW PART tool, then i can not mesh the cylinder like FIG.1. |
||
August 2, 2012, 06:50 |
|
#13 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
look at these pictures. |
||
August 2, 2012, 06:56 |
|
#14 | |||
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,400
Rep Power: 47 |
Quote:
Quote:
If you really want to fully control the outcome of the meshing process, use a meshing tool like ICEM ot Gambit. Quote:
|
||||
August 2, 2012, 06:59 |
|
#15 | |
Senior Member
tmeysam92
Join Date: Jun 2011
Posts: 135
Rep Power: 14 |
Quote:
|
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
A Problem of Fluent Interpreted UDF: parse error | knight | Fluent UDF and Scheme Programming | 25 | August 16, 2018 10:26 |
Two questions on Fluent UDF | Steven | Fluent UDF and Scheme Programming | 7 | March 23, 2018 03:22 |
heat transfer with RANS wall function, over a flat plate (validation with fluent) | bruce | OpenFOAM Running, Solving & CFD | 6 | January 20, 2017 06:22 |
Alias problem when starting FLUENT from command line | batch_error | FLUENT | 0 | May 24, 2012 08:20 |
Problems in lauching FLUENT | Lourival | FLUENT | 3 | January 16, 2008 16:48 |