{"id":17600,"date":"2018-11-22T11:41:46","date_gmt":"2018-11-22T11:41:46","guid":{"rendered":"https:\/\/www.simscale.com\/?page_id=17600"},"modified":"2025-07-17T15:53:43","modified_gmt":"2025-07-17T15:53:43","slug":"compressible-fluid-flow-analysis","status":"publish","type":"page","link":"https:\/\/www.simscale.com\/docs\/analysis-types\/compressible-fluid-flow-analysis\/","title":{"rendered":"Compressible Fluid Flow Analysis"},"content":{"rendered":"\n

The Compressible <\/strong>fluid flow analysis is used to run simulations where fluid density variations have a considerable impact on the flow simulations. Commonly, when the flow velocities exceed ~30% of the speed of sound, compressible effects start to gain importance.<\/p>\n\n\n\n\n\n

\n
\"compressible<\/a>
Figure 1: Compressible aerodynamics simulation over a golf ball showing pressure contours on and around it<\/figcaption><\/figure>\n<\/div>\n\n\n

SimScale makes it possible to simulate compressible simulations. In the following, the setup for a compressible simulation is discussed.<\/p>\n\n\n\n

Creating a Compressible Analysis<\/h2>\n\n\n\n

To create a compressible analysis, first, select the desired geometry and click on ‘Create Simulation’<\/strong>:<\/p>\n\n\n\n

\"simulation<\/a>
Figure 2: Steps to create a simulation in SimScale<\/figcaption><\/figure>\n\n\n\n

Next, a window with a list of several analysis types supported in SimScale will be displayed:<\/p>\n\n\n\n

\"compressible<\/a>
Figure 3: Select the ‘Compressible’<\/strong> <\/em>analysis type from the tree above and click on ‘Create Simulation’<\/strong> at the bottom.<\/figcaption><\/figure>\n\n\n\n
\n
\n

<\/i>Specialized Analysis Type<\/p>\n <\/div>\n

\n

Compressible<\/em> is a specialized analysis type restricted to users with a paid plan. For more details please visit our product & pricing page<\/a> or contact sales.
<\/p>\n <\/div>\n<\/div>\n\n\n\n

Choose the ‘Compressible’<\/strong> analysis type and click on ‘Create Simulation’<\/strong>. This will lead to the Workbench for the compressible flow simulation with the following simulation tree and the respective settings.<\/p>\n\n\n

\n
\"simulation<\/a>
Figure 4: Simulation tree for compressible analysis in SimScale Workbench<\/figcaption><\/figure>\n<\/div>\n\n\n

Global Settings<\/h2>\n\n\n\n

To access the global settings, click on ‘Compressible<\/strong>‘ in the simulation tree. It consists of certain parameters that can be selected to define the simulation. The parameters are listed below:<\/p>\n\n\n\n