{"id":73,"date":"2026-10-10T16:18:18","date_gmt":"2026-10-10T16:18:18","guid":{"rendered":"https:\/\/marouane.site\/?post_type=ms_lesson&p=73"},"modified":"2026-10-10T16:18:19","modified_gmt":"2026-10-10T16:18:19","slug":"visualizing-pressure-and-velocity-in-paraview","status":"publish","type":"ms_lesson","link":"https:\/\/marouane.site\/index.php\/lessons\/visualizing-pressure-and-velocity-in-paraview\/","title":{"rendered":"Visualizing Pressure and Velocity in ParaView"},"content":{"rendered":"\n

Post-processing helps you inspect the solution and communicate its physical meaning.<\/p>\n\n\n\n

A useful figure identifies the field being shown, its units, its location, and any reference-frame choices needed to interpret it.<\/p>\n\n\n\n

Learning objective<\/h2>\n\n\n\n

Create clear pressure and velocity visualizations and explain what they show.<\/p>\n\n\n\n

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Key idea<\/h2>\n\n\n\n

Every CFD figure should answer a defined question and provide enough information for another person to interpret it correctly.<\/p>\n<\/div>\n\n\n\n

Understand the idea<\/h2>\n\n\n\n

Open the case using the method documented in the starter and select the intended saved solution.<\/p>\n\n\n\n

Use a Slice<\/strong> to inspect a plane through the flow. Use Glyphs<\/strong> to display velocity direction and magnitude at selected locations. Use Stream Tracer<\/strong> to explore the direction of a selected velocity field.<\/p>\n\n\n\n

A streamline is tangent to the velocity field at the selected solution state. In unsteady flow, it is not generally the same as a particle trajectory.<\/p>\n\n\n\n

Check which velocity is displayed: absolute and relative velocities have different meanings.<\/p>\n\n\n\n

Also verify the pressure field\u2019s dimensions. Some incompressible solvers use pressure divided by density. Do not label that field in pascals without applying the appropriate interpretation or conversion<\/p>\n\n\n\n

Engineering example<\/h2>\n\n\n\n

Create a slice passing through the rotor axis and colour it by velocity magnitude.<\/p>\n\n\n\n

Use it to identify acceleration, low-speed regions, and possible recirculation. Inspect vectors or streamlines before drawing conclusions about flow direction.<\/p>\n\n\n\n

For comparisons, keep the viewing plane, camera position, field definition, and colour scale consistent.<\/p>\n\n\n\n

Practical task<\/h1>\n\n\n\n

Export three figures:<\/p>\n\n\n\n

    \n
  1. A velocity-magnitude slice.<\/li>\n\n\n\n
  2. A pressure view with correctly identified units.<\/li>\n\n\n\n
  3. A streamline view with its velocity field and seed location documented.<\/li>\n<\/ol>\n\n\n\n

    Add a caption explaining the engineering observation in each figure.<\/p>\n\n\n\n

    Checkpoint<\/h2>\n\n\n\n
    Why can two automatically scaled colour plots be misleading when compared?<\/summary>\n

    Their colours may represent different numerical values. Using a common scale helps distinguish real differences from differences caused by the display settings.<\/p>\n<\/details>\n\n\n\n

    References<\/h2>\n\n\n\n