|
[Sponsors] |
February 24, 2016, 18:46 |
Uneven mesh
|
#1 |
New Member
Antoine Aad
Join Date: Apr 2011
Posts: 10
Rep Power: 15 |
Hi!
I am simulating a non-premixed combustion with DPM on a rocket engine using Ansys fluent. I only enabled the flow and turbulence (in the solution controls), to simulate the cold flow before proceeding with the final simulation. The residuals (continuity, x,y and z) are fluctuating and nowhere near convergence. I think I might have a problem with the mesh! I have a negative pressure gradient on the throat as depicted in the figure below. So I am refining the mesh at the throat. My problem is that I have an uneven mesh at the walls and at the exit of the geometry as shown in the figure below. So how can I solve this problem? |
|
February 25, 2016, 22:45 |
|
#2 |
Super Moderator
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
Blog Entries: 23
Rep Power: 28 |
This looks like a problem related to geometry . make sure you have a clean surface, no divided edge . can post a screenshot of your geometry . from desigbmodeler maybe?
|
|
February 26, 2016, 07:38 |
Geometry/DesignModeler
|
#3 |
New Member
Antoine Aad
Join Date: Apr 2011
Posts: 10
Rep Power: 15 |
Here's the images showing the back and front of the rocket engine, and on the left (the details view) and the tree outline.
Is there something I should modify in the properties on the left pane? |
|
February 26, 2016, 12:07 |
tetrahedron mesh
|
#5 |
New Member
Antoine Aad
Join Date: Apr 2011
Posts: 10
Rep Power: 15 |
I'm using a tetrahedron element with advanced size function of "proximity and curvature", and went up from 1,700,000 elements to 7,269,391 elements (in a 20 cm long geometry). Do you think that hexahedral mesh will solve the problem? take a look at the new mesh.
|
|
February 26, 2016, 12:24 |
|
#6 |
New Member
Presteina
Join Date: Feb 2016
Location: Canada
Posts: 16
Rep Power: 10 |
Hi,
Your works seems to be so good with DPM spray. I am also working on DPM. Can you help me out with the Spray modeling in non premixed combustion model ? I am not able to get the spray in the form of droplets which also interacts with the continuous. Thanks a lot in advance. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
sliding mesh problem in CFX | Saima | CFX | 46 | September 11, 2021 07:38 |
Star CCM Overset Mesh Error (Rotating Turbine) | thezack | Siemens | 7 | October 12, 2016 11:14 |
[ICEM] surface mesh merging problem | everest | ANSYS Meshing & Geometry | 44 | April 14, 2016 06:41 |
[ICEM] Problem making structural mesh on a surface | froztbear | ANSYS Meshing & Geometry | 1 | November 10, 2011 08:52 |
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! | sc298 | OpenFOAM Meshing & Mesh Conversion | 2 | March 27, 2011 21:11 |