Quote:
Originally Posted by freebeard
Sounds like you've been doing some homework.
This is where I think OpenVDB shows benefit.
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The only CFD that will 'solve' an automobile completely is the 3D, Full Navier-Stokes Equations for viscous flows, plus a turbulence model.
The billions of cells required are presented in a spherical-coordinate system, with the vehicle at the 'center of the universe.'
The vehicle, along with the entire domain within the virtual test section must be 'solved' simultaneously, each cell affected by the dynamics of each cell bordering it, plus the boundary of the vehicle and 'floor.'
Cartesian grids can't do it.
X, y ,z, time, velocity, pressure, friction, inertia,, etc., for each cell is being solved as a function of what all it's surrounding neighbors are doing simultaneously.
As of 2011, computers were still not powerful enough to accommodate the requirements of the full Navier-Stokes equation.
They had it by 2014.
Industrial Light & Magic employed 3D- scans of actual 'real' dynamics to create the algorithms used in their CGI creations.
Take what they used and multiply by a thousand, and you might begin to represent what the full Navier-Stokes equations must navigate to predict, within 99% accuracy, what air is 'doing' around an automobile and it's flow domain. It makes 'rocket-science' look like 'Tinker-Toys'. I'm quite serious!