To start this tutorial, you have to import the tutorial project into your ‘Dashboard’ via the link above.
The CAD model
Once the ‘Work bench’ is open you will be in the ‘Geometries’ tab.
The CAD model named “underrun-protection_design-1” would be displayed in the viewer, as shown below
You can interact with the CAD model as in a normal desktop application
Create a Static Analysis
To create a new simulation click on the ‘+’ option next to the ‘Simulations’ tab
In our case we are interested in running a static stress analysis, so select the Static Analysis option and press ‘Ok’
After clicking ‘Ok’, a new tree will be automatically generated in the left panel with all the parameters and settings that are necessary to completely specify such an analysis.
All parts that are completed are highlighted with a green check. Parts that need to be specified have a red circle. While, the blue circle indicates an optional settings that does not need to be filled out
Create a mesh
As Finite Element analyses are carried out on discretized domains, we have to generate a Mesh for our CAD model.
Therefore as the next step select the Mesh option
Default mesh parameters are used, as shown in figure
The Tet-dominant is the only algorithm available for FEA cases such as ours
First order elements are used here
Note that the results generated with First order elements might not be as accurate as with Second order elements. But choosing a Second order mesh will lead to longer computing times so is avoided here.
As for the fineness of the mesh, Coarse is sufficient. As a rule of thumb, one should make sure, that the resulting mesh does have more than one volume layer across the cross section of the model.
For actually starting the mesh operation hit the ‘Generate’ button, highlighted in the figure below
The resulting mesh is shown in figure below
There is also a Meshing log (highlighted below) available which provides quantitative information about the mesh in terms of its node and element count and other relevant data
That completes the mesh generation.
Material selection and assignment
Next, add the materials from the ‘Material Library’ for fluid and the solid phases. First, we start with clicking on sub-tree “Materials”, click on ‘+’ from the options panel as shown.
This pops-up a ‘Material Library’ from which we select “Steel” and click on ‘Ok’. This will then load the standard properties for steel.
Then, assign the material to the domain and save.
Now, we come to define the boundary conditions.
To create a boundary condition, click on the ‘+’ option next to the Boundary conditions and select the required boundary condition from drop down menu, as shown in figure.
We start with the Constraint boundary conditions at the fixation holes
For this select the ‘Fixed Value’ boundary condition from the drop down menu
Set the displacement to zero in all directions, as shown on figure.
Next, assign this boundary condition to the fixation holes
Clicking on Save completes the definition of this boundary condition
The second boundary condition is the actual pressure load that acts on the shield of the underrun protection
So we select the ‘Pressure’ boundary condition from the drop down menu
Enter a pressure value of 25 bar or 2.5*10e6 Pa
Assign the boundary condition to ‘solid_0_face_7’, as shown in figure below
The next two tree items Numerics and Simulation Control are already indicated as complete via the green checks. This means that reasonable default values are already chosen for it, so we leave them as they are.
Start a simulation run
The last thing to do for running this simulation is to create a run.
The new run is created by clicking on the ‘+’ symbol next to ‘Simulation Runs’
Give a name to the run and start the run
Once the simulation is finished, select the ‘Solution fields’ under the Run to post process the results on the platform. Or they can be downloaded and post-processed locally (e.g. with ParaView)
Some post processing images from the SimScale platform post processor are shown below.
Select the results and click “Von mises stresses” to visualize the Von mises stresses in the structure
Similarly the displacement field can be visualized as shown below
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