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Documentation

Simulation Setup

The SimScale workbench is designed as a single interface for the application of multiple simulation types. After you have prepared and uploaded your CAD model into the workbench, you are ready to set up your simulation. The first step you will need to do is choose an analysis type, to choose an analysis type, click on the ‘Create Simulation’ button in the geometry dialog box or click on the ‘+’ sign besides Simulations in the navigation tree as circled below:

geometry dialog box and navigation tree of simscale with create simulation button in geometry dialog box and the plus sign beside simulation are highlighted to show the first step in simulation setup
Figure 1: Geometry dialog box.

Following the above steps a window that contains all the available analysis are shown:

simulation list in simscale with create simulation button highlighted to show how to select a simulation analysis
Figure 2: List of analysis types.

Hit ‘Create Simulation’ one more time and you are good to go. A simulation tree will appear showing the steps necessary for that particular simulation setup.

Note

This page provides a general information on how to setup a simulation. Some elements in the simulation tree will only be available for certain analysis types, for example, contacts will only be available for structural analysis. Know more about individual analysis types here.

Simulation Tree

The simulation tree shows the steps necessary for the user to define before the simulation can run.

simulation tree of a static analysis to visualize the steps required for a simulation
Figure 3: Simulation tree as seen in the SimScale workbench.

Some steps will have different status icons, this describes whether the corresponding step needs to be configured by the user or not. The colors and its description can be seen below:

  • Incomplete state incomplete state symbol: This symbol means that the user will have to define the corresponding setting to be able to run a simulation because it is a critical setting. For example Material and Boundary conditions.
  • Complete state : The user does not need to configure this step further unless it is necessary to do so. For example Geometry, Numerics, and Simulation control.
  • Optional state optional state symbol: The user will have to check the corresponding setting to inspect whether it can be applied for the specific simulation indicating that it is optional. For example, Mesh.
  • Error state error state symbol: This symbol means that there has been an error in the corresponding settings. For example, no values have been set for a boundary condition or using negative flow rate values.

Global Settings

In the global settings, the user can change the behavior of the model used for the simulation. For example, in a static analysis, a choice between linear and non-linear analysis or the type of the turbulence model applicable to fluid flow can be made.

One can find the settings that are a part of the global settings here.

Geometry

The geometry displays all the uploaded geometry in the project. The user can switch between geometries for the same simulation analysis. One will be able to use different design iterations for the same simulation settings, however, if the faces of the geometry are different the user will need to re-assign the other settings once more.

The user can find more information regarding the requirements for the geometry for a simulation here.

Materials

This is where the user defines the simulated material, such as the fluid in a CFD simulation or the material of a solid in a structural analysis. The user can use a predefined material that is available in SimScale or use a custom material by changing the physical properties of the material.

Note

Read more about how to define custom materials here.

One can find more information regarding the materials and its behavior here.

Initial Conditions

The user can set an initial condition for the simulation globally or via subdomain(s). Initial conditions can help in reaching a converged solution faster which saves you the computing resources. One can assign initial conditions either as uniform or in subdomains.

Interested readers are referred here for more information.

Boundary Conditions

Boundary conditions define how a system (structure or fluid) interacts with its environment. The inlet and outlet are examples of a boundary condition for a flow simulation while the load and pressure are for an FEA simulation. The lists of boundary conditions available will differ depending on the type of simulation selected beforehand.

More information about boundary conditions for each analysis types can be read here.

Advanced Concepts

You can define complex models, such as rotating zones, porous media, and momentum sources to model accurate physical conditions for a problem leading to more accurate results when dealing with models such as fans, turbines, tress representing a porous media, etc.

The user can find information regarding the available advanced concepts that can be applied in a simulation here.

Numerics

The user can configure the equation solver for the simulation, change the convergence settings, and other numerical settings necessary to reach a converged solution. However, it is worth keeping in mind that this is for advanced users only. For most of the cases, default settings are enough.

This is the brains behind running the simulation. Here, you have control over the schemes, solvers, relaxation factors, tolerances, etc that can lead to a successful and efficient solving of a simulation problem. Through these settings, you can control the convergence and stability. It is worth keeping in mind that this is for advanced users only. For most of the cases, default settings are enough.

More details about numerics accessible here for CFD and on this blog for FEA.

Simulation Control

This is where the user can configure the amount of time the simulation is allowed to run, the number of results that will be saved, and the number of processors that will be used in the simulation.

The user can find more information about how to control the simulation here.

Result Control

If necessary, the user can define additional results to be exported. For example, forces and moments, surface data, and field calculations are some of the additional results that can be exported. The user can also place probe points in the model.

One can read more about how to control the outputs of the result here.

Mesh

This is where the discretization of the model is defined. The user can choose the meshing algorithm and the level of fineness that the mesh needs to achieve. The quality of the mesh heavily influences whether the simulation can be run or if the results are accurate enough. The user can also create multiple meshes for one geometry. Experience the Hex-dominant, Tet-dominant, or the new standard mesher today.

The user can find an explanation about meshing and more information regarding the mesh settings here.

Simulation Run

After the user has defined the necessary settings, the simulation is ready to run. One can name each simulation run to their liking to easily differentiate between simulation runs if multiple runs are in the plan.

Note

If you have questions or suggestions, please reach out either via the forum or contact us directly.

Last updated: July 13th, 2020

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