Polyflow does not accept the mesh

Jasmina92 · August 8, 2018, 11:35

Hello,
I want to model a high viscous flow through a conical die with Polyflow.
I double checked the setup and adjusted the mesh again and again - but I always receive the same Error-message.
The calculation didn't converge because of bad shaped elements.
Here is the original message:

Summary of the simulation:

The computation failed.

* Expert tool diagnostics *
The problem F.E.M. Task has not converged.

* Expert tool advice in order to optimize the simulation *

At least one bad element has been detected in the mesh.
The worst has the following feature(s)
Too small angle in element 276439, (x,y,z) = (0.027134,
8.2309e-005, 8.2309e-005).
This can lead to local inaccuracies and possibly convergence
difficulties. It is strongly recommended to fix the mesh.

I checked the location of the bad element, it is a different Element with every new setting of the mesh.
Unfortunatly I have no ideas how to fix this - the initial mesh looks appropriate to me.
I used a hexaeda mesh (and also checked a triangular: same message), the remeshing locations I set for either the whole geometry (pipe + jet) or just the extrudate.
The problem stays.

Hast anyone an idea how to tell polyflow that the mesh is alright?

Many thanks!
Jasmina

Jasmina92 · August 19, 2018, 10:10

... For a better remeshing I also checked the "generate a sliceable free jet" - option. this helped for one setting, but after a small change in other settings (e.g. material data, meshing) the error message (see above) appeared again.
Maybe someone has an idea why..

August 8, 2018, 11:35	Polyflow does not accept the mesh	#1
Jasmina92 New Member Jasmina Join Date: Apr 2018 Location: Germany Posts: 11 Rep Power: 8	Hello, I want to model a high viscous flow through a conical die with Polyflow. I double checked the setup and adjusted the mesh again and again - but I always receive the same Error-message. The calculation didn't converge because of bad shaped elements. Here is the original message: Summary of the simulation: The computation failed. * Expert tool diagnostics * The problem F.E.M. Task has not converged. * Expert tool advice in order to optimize the simulation * At least one bad element has been detected in the mesh. The worst has the following feature(s) Too small angle in element 276439, (x,y,z) = (0.027134, 8.2309e-005, 8.2309e-005). This can lead to local inaccuracies and possibly convergence difficulties. It is strongly recommended to fix the mesh. I checked the location of the bad element, it is a different Element with every new setting of the mesh. Unfortunatly I have no ideas how to fix this - the initial mesh looks appropriate to me. I used a hexaeda mesh (and also checked a triangular: same message), the remeshing locations I set for either the whole geometry (pipe + jet) or just the extrudate. The problem stays. Hast anyone an idea how to tell polyflow that the mesh is alright? Many thanks! Jasmina

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to set periodic boundary conditions	Ganesh	FLUENT	15	November 18, 2020 07:09
[Other] conformed FSI mesh for unstructured fluid region	ashish.svm	OpenFOAM Meshing & Mesh Conversion	10	August 2, 2019 09:40
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation	tommymoose	ANSYS Meshing & Geometry	48	April 15, 2013 05:24
engrid -> save as .stl with boundarie codes	Zymon	enGrid	31	August 29, 2011 14:40
fluent add additional zones for the mesh file	SSL	FLUENT	2	January 26, 2008 12:55

August 19, 2018, 10:10		#2
Jasmina92 New Member Jasmina Join Date: Apr 2018 Location: Germany Posts: 11 Rep Power: 8	... For a better remeshing I also checked the "generate a sliceable free jet" - option. this helped for one setting, but after a small change in other settings (e.g. material data, meshing) the error message (see above) appeared again. Maybe someone has an idea why..