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In some cases a pressure diffusion process can be fairly approximated by a hybrid model based on PDE with constant coefficients and Pseudo Pressure PseudoPressure and Pseudo TimePseudoTime.
There is a number of specific pressure diffusion models which represent the key practical scenarios of pressure diffusion and play important academical and practical role:
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[ Slightly Compressible Flow ] [ Pseudo PressurePseudoPressure ] [ Pseudo TimePseudoTime ]
[ Radial Flow Pressure Diffusion @model ] [ Linear Flow Pressure Diffusion @model ]
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