Tested with CGX 2.20 / CCX 2.20
- Steady state thermal analysis
- Prescribed volumentric heat production, isothermal boundary and prescribed flux density
- Comparison of averaged and non-averaged nodal solution
- Comparison of 3D solid model and 2D plane model
Issue
Due to wrong surface definition by CGX (for the given topology, the edge at x=L should be S1 of element 1 and not S4 as written in the xL.sur file.
the result of the 2D model isn't correct. On the right end you see a skewness in the flux distribution (T should not depend on y). Also, the path plot shows that at x = 3 m the value of q isn't correct (should be 0.5).
| File | Contents |
|---|---|
| run.fbd | CGX script for 3D model |
| solve.inp | CCX input for 3D model |
| solve_sep.inp | CCX input for non-averaged solution (3D-model) |
| run2d.fbd | CGX script for plane model |
| solve2d.inp | CCX input for plane model |
| solve2d_sep.inp | CCX input for non-averaged solution |
| path.gnu | Gnuplot control file for the combined path plot (3D) |
| path2d.gnu | Gnuplot control file for the combined path plot (2D) |
| test.py | Python script to run the simulation |
The model represents a uniform bar for demonstration of 1D steady state heat conduction
| Parameter | Value | Meaning |
|---|---|---|
lx |
3 | x dimension in m |
ly |
1 | y dimension in m |
lz |
1 | z dimension in m |
The parameters are defined in run.fbd and run2d.fbd
The geometry consists of a hexaeder. It is meshed with 3 C3D8 elements.
> cgx -b run.fbd
The script does the following
- Create geometry and mesh
- Write set definitions
- Produce a mesh plot
- Run the averaged solution
- Create q contour plot and path plot
- Call
separate.pyand run the non-averaged solution - Create q contour plot and path plot
- Create the combined plot
The geometry consists of a quadrilateral in the xy plane. It is meshed with 3 CPS4 plane stress elements, which are expanded into 3 C3D8 elements.
> cgx -b run2d.fbd
The script does the following
- Create geometry and mesh
- Write set definitions
- Produce a mesh plot
- Run the averaged solution
- Create q contour plot and path plot
- Call
separate.pyand run the non-averaged solution - Create q contour plot and path plot
- Create the combined plot
