How to set up nonsteady simulation

Oleksandr Grinenko

2 Aug, 2025 07:36 PM

Hello people,

In this tutorial - nonsteady thermomechanical FEM simulation.
Heat flux load for heat sink.

Link to the video with descriptions here:
https://vimeo.com/1106773772

1. Step 1: Description

   Simulation details

   Temperature B.C.(boundary condition):

   T_ambitient=300 K;

   C_flux=70 W;

   alpa_convetion = 10 W / m^2 / K;

   
   

   Mechanical B.C.: u,v,w, rot u, rot v, rot w = 0 

   
   

   Material: Aluminum Generic

   
   

   FreeCAD Options: Solver CCX Standard

   Mesh Netgen optimized (not second order)

   Basic steps carried out in this demo are:

   
   

   1) Choose FreeCAD FEM Workbench

   
   

   2) Create Analysis container

   

   
   

   3) Apply material

   

   
   

   4) Thermodynamical constraints & loads

   

   5) FEM Mesh from shape from Netgen (simplified)

   

   6) Select SolverCcxTools>Analysistype=thermomech

   
   

   7) Select SolverCcxTools>Thermo Mech Steady State=false

   
   

   8) Time End= 2 ( U can set up desired time here)

   
   

   9) Write .inp Files und Run Solver 

   
   

   7) View Results: heat flux, displacement, temperature

   
   

   
   

   Thanx for your attention !

2. Step 2: SolverCcxTools Options