{"id":17615,"date":"2018-11-24T16:55:21","date_gmt":"2018-11-24T16:55:21","guid":{"rendered":"https:\/\/www.simscale.com\/?page_id=17615"},"modified":"2025-07-17T15:19:37","modified_gmt":"2025-07-17T15:19:37","slug":"incompressible-fluid-flow-analysis","status":"publish","type":"page","link":"https:\/\/www.simscale.com\/docs\/analysis-types\/incompressible-fluid-flow-analysis\/","title":{"rendered":"Incompressible Fluid Flow Analysis"},"content":{"rendered":"\n

The Incompressible <\/strong>fluid flow analysis is used to run fluid simulations<\/a> where density variations are negligible. This assumption is typically valid when velocities and temperature gradients are small.<\/p>\n\n\n\n\n\n\n

Mathematically speaking, the divergence of the flow velocity (\\(u\\)) is zero:<\/p>\n\n\n\n

$$\\nabla.u = 0$$<\/p>\n\n\n

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\"incompressible<\/a>
Figure 1: Incompressible aerodynamics simulation over ‘Burj-Al-Arab’ with velocity streamlines and turbulent viscosity contours<\/figcaption><\/figure>\n<\/div>\n\n\n

Within SimScale, one can effortlessly set up an incompressible simulation with the steps described below.<\/p>\n\n\n\n

Creating an Incompressible Analysis<\/h2>\n\n\n\n

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

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

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

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

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

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\"list<\/a>
Figure 4: Simulation tree for incompressible 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 ‘Incompressible<\/strong>‘ in the simulation tree. It consists of certain parameters that can be selected to define the fluid simulation<\/a>. The parameters are listed below:<\/p>\n\n\n\n