# Tutorial: Linear Static Analysis of a Crane

## Overview

This tutorial provides a step-by-step guide on how to set up a linear static analysis simulation for a crane.

## Create Simulation

As a first step, import the tutorial project into the SimScale workbench.

By importing the tutorial project, a new project will be created for you, and the ‘Workbench’ will open with the prepared tutorial geometry already loaded into the viewer.

• To create a new simulation, click on the “+” button next to ‘Simulations’ in the tree or the “Create Simulation” button on the geometry panel.
• Select the “Static” analysis type and click “Create Simulation“.
• A new simulation tree containing all parameters and settings needed to define the conditions of the analysis will be created.
• All setup steps that are completed are highlighted with a green check. Steps that require some user input are shown with a red circle. Steps that have a blue circle indicate optional settings.

## Simulation Setup

### Model

A gravitational load can be applied on the whole domain in the Model section. In order to specify a gravitational load you have to determine the magnitude and the direction of the gravity field. We apply a gravitational load of 9.81 m/s² in the -y direction (direction vector: 0 -1 0).

### Materials

Now it’s time to define the part materials.

• 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 volume ‘solid1’ and save.

### 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.
• As the crane should be fixed on the one end, we start with a constraint boundary condition.
• For this select the ‘Fixed Support’ boundary condition from the drop down menu
• Next, assign this boundary condition to the the three faces at the end of the crane structure (faces highlighted in figure)
• Clicking on Save (the blue tick button) completes the definition of this boundary condition
• Next add a Pressure boundary condition. We simplify the load caused by a lifted body by a negative pressure (force F boundary condition: Pressure) on the lower face of the box at the end of the crane opposite to the fixed boundary condition.
• The load is assumed to take the value 10000 N. As pressure is a distributed loading type it is necessary to apply the load using N/m² as unit. So we divide the load by the area of the face (0.25 m²) and get a value of 40000 N/m².
• This is assigned to the lower face of the box (highlighted in figure below)

### Numerics

• The tree item Numerics allows us the control the solving mechanism in detail
• In this tutorial, we use the default Numerics

### Simulation Control

• The next important tree item is Simulation Control which allows to steer the overall simulation settings
• We choose let the machine calculate the number of cores required

## Mesh Setup

• Select the mesh option and set the parameters as shown in figure below
• The default mesh parameters are used in this tutorial
• The Tet-dominant mesh algorithm is the only option available as this is an FEA application
• Automatic mesh sizing with Second Order elements are used. Second order elements will give more accurate results, so use when possible
• As for the fineness of the mesh, Coarse is sufficient.
• For actually starting the mesh operation hit the ‘Generate’ button

## Start Simulation

Now the simulation setup is complete and you’re ready to start your simulation. To begin the simulation, a simulation Run needs to be created. A simulation Run creates a snapshot of the current setup and tries to compute the results based on the snapshot settings.

• 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

## Results

Computation of the results can take up to a few hours. You’ll be informed via email once your simulation run is finished. Once finished, you’re ready to analyze the results.

• 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” to visualize the Stress Profile and enable displacement. The displacement below is scaled to 500x.

Congratulations! This concludes the linear static analysis of a crane tutorial.