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How to Run a Simulation in OnScale Solve™

By Chloe Allison 10 February 2021

This is a guide to detail the steps you need to take in OnScale Solve to run a simulation once you have created a model. This article will cover the following:

  • Meshing process 
  • Estimation
  • Choosing cloud hardware
  • Simulator tree 

The first step in getting a model ready for simulation is meshing. Meshing in OnScale Solve is automatic, to trigger the automatic mesh generation, simply click on the Generate Mesh button to begin the process. If this button is not available to select the chances are you have missed one of the important model creation steps listed below:

  1. Import 3D CAD into the modeler 
  2. Assign materials to the CAD using the Modeler Toolbar
  3. Apply Constraints for the Physics you’re interested in simulating using the Physics Toolbar

For a more detailed explanation of the above steps check out our OnScale Solve Simulation Tutorials, we have tutorials that cover Mechanical and Thermal simulations. 

Once you have done that, moving to the Simulator Toolbar, you will have the Simulator Tree on the left and the Estimator on the right (Figure 1).

Simulator tree

Figure 1. Simulator tree (left) and the estimator (right)

The Simulator Tree on the left contains information on model materials, physics, constraints and simulations. Parameters will also show here if used. These properties can be edited in the tree.

When you click ‘Mesh & Estimate’, our mesh algorithm will perform the analysis to create 5 different meshes ranging from Very Coarse to Very Fine for you to use. Once you have meshed and estimated the different mesh densities can be selected using the mesh slider.

OnScale Solve

Figure 2. Mesh slider and advanced mesh settings

Additional settings are available to view the selected mesh and also, to display a range of mesh metrics with the ‘Advanced Mesh Settings’. 

You can also view the mesh before submitting a simulation by clicking .

Using the CAD from the connecting rod tutorial we can mesh and visualize the meshes, let’s look at the difference between the very coarse and very fine options.

OnScale Solve mesh

Figure 3. Very coarse and very fine OnScale Solve mesh comparison

With all these features in place, it provides a simple workflow enabling complex CAD geometries to be meshed and simulated with ease on the OnScale Solve platform without the need for any user input.

Selecting the Mesh & Estimate option runs the mesh and estimate process sequentially for a medium mesh. The estimate step returns the Core-Hour (CH) cost and solve time for a medium mesh. However, you can do these steps individually by selecting ‘Generate Mesh’ and then selecting ‘Estimate’ once you have chosen a mesh. If you accidentally choose ‘Mesh & Estimate’ you can go back and adjust the slider to a different mesh but this will require re-estimation.

The next step is to select the amount of CPUs used to simulate the model. A graph will appear after estimating which displays the solve time on the Y axis and the CH cost on the X axis. The slider can be adjusted to choose the solve time or CH cost. Be careful when selecting this as  reducing the solve time will cost more CHs because more CPUs are being requested to run the simulation.

Simulation Estimator

Figure 4. Estimator

Finally, clicking ‘Run’ will launch the job on the cloud and then you can move on to the Post Processing stage.

Getting Started with OnScale Solve

Engineers, designers, analysts, and current OnScale users can learn more about OnScale Solve and run their first cloud engineering simulation study by accessing these resources:

With OnScale Solve you can work, collaborate, and share from any location and device. Ready to go? Create your free account today and start simulating with OnScale Solve! If you have any questions please contact us at info@onscale.com!


Chloe Allison
Chloe Allison

Chloe Allison is an Application Engineer at OnScale. She received her MA in Electrical and Electronics Engineering from the University of Strathclyde. As part of our engineering team Chloe assists with developing applications, improving our existing software and providing technical support to our customers.

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