I tested the viscoelastic flow using isothermal PTT model, and I flowed the suggestion from the user guide:
"""
You have defined a viscoelastic model.
In order to avoid convergence difficulties, it is recommended to activate the convergence strategy for viscoelasticity or to define an (increasing) evolution function for the flow rate. """
I tried both of the two and both, while all of them output the error message in the iteration:
"""
Linear solution unsafe;
increasing delaying to 3.15 and cancelling increment.
Linear solution unsafe;
increasing delaying to 4.73 and cancelling increment.
Divergence detected for field T_DEVSS__1: iterations cancelled by Expert System
Divergence detected for field D_DEVSS: iterations cancelled by Expert System
Divergence detected for field VELOCITIES: iterations cancelled by Expert System
Divergence of influent solver occurred !
Worst solver is :F.E.M. Task
"""
by the way , there was a free surface extruded from the Die by using remeshing technique in POLYFLOW.
Thank you very much for browsing and looking forward to your answers.
Jichun Zhao The issue of Linear solution unsafe in Ansys Polyflow can indeed be perplexing, especially when dealing with viscoelastic flows.
To optimize Polyman simulations, add the keyword MCONTR 20 to Tools > Options > Polyflow. In the Workbench environment, right-click on the Solution cell and select Polyflow. If issues persist, increase the MCONTR argument.
@Alvena Shahid, Hi, thank you very much for sharing your method, personal reasons for replying now, I'm sorry.
For the two parts shown in Figure 01.png, do you mean: Do you need to add the MCONTR keyword to.p3rc? I don't know if I'm taking this the right way.
I operate in a separate polyflow software. Is that enough?
Then I started trying to use polyflow in the workbench, and I didn't see the optional Polyflow by clicking on the Solution cell right. Figure 02.png.
In addition, I need to explain that I calculate the extrusion process of the polymer system, which involves the development of the free surface, and I do not know what conditions are required to complete the calculation successfully.
Wish all the bestThank you
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