CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Fluent Icem Problem (laboratory stand)

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 28, 2019, 08:41
Post Fluent Icem Problem (laboratory stand)
  #1
New Member
 
Igor
Join Date: Aug 2019
Posts: 2
Rep Power: 0
OBOLLI is on a distinguished road
Good day to all.
I ask you for help, since I myself canít find a logical solution to my problem.

The principle of operation of the installation under study:
Through two horizontal pipes, air enters a metal container, inside of which there is a metal funnel (Picture A).
The pink part of the funnel will later be made of perforated sheet with a large number of holes. But at this stage of design, it is taken as a continuous sheet of metal, i.e. air from the container should flow through the bottom of the funnel into a thick pipe, and then out.

I built MESH in ICEM 15.0 (Picture A. I can only in this version of the program) with a MESH size of 0.017 (it was this size that ensured the highest MESH quality). The quality of MESH for various indicators is satisfactory (Picture B, "Angle", of course, is doubtful).

There are no errors when opening the Meshfile in Fluent 15.0, and when you check with "CHECK", no errors also arise (Picture C).

I set the air velocity at the inlet 10 m/s, Pressure-Outlet and K-epsilon Viscous Model (Picture C).

Immediately after the start of the solution, errors occur with "turbulent viscosity limited to viscosity ratio of 1.0000e05 in XXX cells" and "reverced flow in XXX faces on pressure-outlet" (Picture D),

these errors continue until the end of the solution (Picture D).

Picture 7 shows one example lasting 500 Iterations. There were other attempts that lasted more than 650,000 Iterations and led to the same result. I open the resulting result in "cfx5POST" and get the following result (Picture E).

1) It can be seen on it that the air flow (Speed 10 m / s), leaving horizontal pipes, simply flows down like a liquid and further vortices are simply illogical.
2) There should also be a symmetry between the two inputs (since 2 pipes).
3) And as a result, the air does not exit at all through a vertical pipe, as if the bottom of the funnel was brewed. But this is not so !!! (Picture E)There are definitely "fluid" blocks.
4) Also, the air velocity over time is constantly increasing inside the container, which is physically impossible

For comparison: the same setup, but without a funnel with a flow velocity of 10 m / s, looks like this (Picture E).

Perhaps the matter is precisely in the poor quality of MESH according to the "ANGLE" indicator.

I dont know. Please help me find a solution to my problem.
Attached Images
File Type: png Picture A.png (85.7 KB, 5 views)
File Type: jpg Picture B.jpg (96.5 KB, 5 views)
File Type: png Picture C.png (52.0 KB, 6 views)
File Type: png Picture D.png (33.5 KB, 5 views)
File Type: jpg Picture E.jpg (140.2 KB, 4 views)
OBOLLI is offline   Reply With Quote

Old   September 30, 2019, 04:36
Default
  #2
Member
 
Join Date: Mar 2016
Posts: 73
Rep Power: 8
sufjanst is on a distinguished road
Do you have the volume elements in different parts in ICEM? If yes, you should set both to fluid in fluent, sometimes this does not happen automatically. Alternatively, you can put all volume elements into one part and you should be fine.


Next thing is, is your scaling correct? Your y-coordinate goes up to 2,4 meters.
sufjanst is offline   Reply With Quote

Old   September 30, 2019, 10:01
Default
  #3
New Member
 
Igor
Join Date: Aug 2019
Posts: 2
Rep Power: 0
OBOLLI is on a distinguished road
Hello, sufjanst
* 1) Yes, they are installed as Fluid in the fluent. I can’t put all the volume elements in one part, since the middle part of the funnel will be a separate perforated sheet, for further research.

2) Yes, that's right. The height of the laboratory stand is 2.4 meters.
OBOLLI is offline   Reply With Quote

Reply

Tags
angle of attack, boundary conditions, fluent 15.0, icem 15.0, solution error

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
looking for a smart interface matlab fluent chary FLUENT 24 June 18, 2021 10:07
problem to export mesh from icem to fluent alejorol586 ANSYS Meshing & Geometry 1 January 24, 2017 09:41
The fluent stopped and errors with "Emergency: received SIGHUP signal" yuyuxuan FLUENT 0 December 3, 2013 23:56
Problem in using parallel process in fluent 14 Tleja FLUENT 3 September 13, 2013 11:54
Problem with 2D ICEM mesh check in fluent Nicola FLUENT 3 March 25, 2013 06:56


All times are GMT -4. The time now is 06:37.