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About Eulerian Wind Tunnel
This application is an educational Eulerian Computational Fluid Dynamics (CFD) simulator, specifically tuned to visualize incompressible fluid flow passing over a blunt cylindrical obstacle.
Visualizations
- Vector Field: Check 'Vectors' to see an overlaid vector field. You can use the 'Vec Spacing' and 'Vec Scale' sliders to adjust the density and size of the arrows.
- Vorticity Confinement: Numerical dissipation naturally destroys vortices in Eulerian grids. This feature calculates the curl of the velocity field and injects a localized rotational force back into the fluid to preserve angular momentum.
- Lagrangian Particle Tracers: Unlike continuous Eulerian smoke (which gets blurred by the grid), thousands of independent point-particles are injected into the flow and tracked individually. They naturally cluster into crisp, beautiful vortex spirals.
- Subtract Mean: Subtracts a percentage of the free-stream flow velocity from the vector, tuft, and streamline visualizations to help isolate rotating vortex cores (Galilean Decomposition).
Real-Time Data Extraction & Recording
- Placement: Check the boxes (S1-S5) to activate sensors. Once active, they appear in the flow field. Click and drag them with the left mouse button to any location in the wake.
- Live Plotting: Use the "Plot Variable" dropdown to select what the sensors display on the oscilloscope. It automatically bounds the Y-axis to the global min/max experienced by the active sensors.
- Data Export (.csv): Click "Record Data" to begin capturing data. When you click stop, the simulator will automatically download a CSV file. It captures the physical simulation time and the Ux, Uy, Pressure, and Vorticity simultaneously for every active sensor.
Credits & License
Original Developer: Matthias Müller ("Ten Minute Physics").
Modifications tailored for academic cylinder flow visualization.
MIT License:
Copyright 2022 Matthias Müller.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.