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The usual combination are:
| Linear Analytical 1D | Pseudo-Linear Analytical 1D | Non-Linear Numerical 2D/3D |
|---|---|---|
| Single- |
| phase Linear Analytical 1D | Single-phase Pseudo-Linear Analytical 1D | Multi-phase Non-Linear Numerical 2D |
| Multi-phase Linear Analytical 1D | Multi-phase Pseudo-Linear Analytical 1D | Multi-phase Non-Linear Numerical 3D |
In many practical cases a pressure diffusion process is honouring some PDE with constant coefficients availing a number of very efficient computational and diagnostic techniques:
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