RE: [chrono] Polymer process simulation

[Dan Negrut]

Hi,

Something like this can be done in Chrono.

We haven’t done it before since we have not had a project on this topic, but there is a mechanism to provide constitutive equations in the SPH solver. For instance, the CRM solution handles conservation of mass, of momentum, and an objective stress rate of change (Jaumann equation) to handle non-associative plasticity.

It’s not a stroll in the park, but it’s doable.

 

Another mechanism is through DEM. As of recently, there is support for heat transfer in the Chrono DEM solver. Compared to StarCCM+ and LAMMPS, the Chrono DEM is very fast (see this 3^rd party benchmark: Reger, David, Elia Merzari, Paolo Balestra, Ryan Stewart, and Gerhard Strydom. "Discrete element simulation of Pebble Bed Reactors on graphics processing units." Annals of Nuclear Energy 190 (2023): 109896).

 

Dan

---------------------------------------------

Bernard A. and Frances M. Weideman Professor

NVIDIA CUDA Fellow

Department of Mechanical Engineering

Department of Computer Science

University of Wisconsin - Madison

4150ME, 1513 University Avenue

Madison, WI 53706-1572

608 772 0914

http://sbel.wisc.edu/

http://projectchrono.org/

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From: 'EonYeon Jo' via ProjectChrono <projec...@googlegroups.com>
Sent: Wednesday, February 5, 2025 10:19 AM
To: ProjectChrono <projec...@googlegroups.com>
Subject: [chrono] Polymer process simulation

 

Hi All,

I am working on polymer extrusion and deposition simulation (3D printing with polymers) and wanted to check if this can be implemented in ProjectChrono. Below are the key details of the process:

1. Molten polymer is extruded from the nozzle at melting temperature with a shear rate.
2. The substrate is deposited onto the printing bed or a previously deposited bead.
3. The material cools and solidifies after deposition.

Currently, we are not considering phase change, but we would like to incorporate temperature- and shear rate-dependent viscosity changes. This means the simulation should be able to calculate shear rate and track temperature variations throughout the process.

I would appreciate any suggestions or guidance on this.
Thank you in advance!

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