A gas is a compressible fluid, and the change in volume is considerable with moderate variation of pressure.
Water is comparatively very heavy, inelastic and incompressible; air, on the other hand, is comparatively very light, elastic and compressible.
The UM uses a full compressible equation set, no turbulence closure (numerical diffusion only) and a hybrid terrain following co-ordinate system.
We apply the method to compressible and incompressible linear elasticity problems, including problems with stress singularities.
Once in the skin, the allergen may produce a classic immune wheal and flare response (a skin lesion with a raised, white, compressible area surrounded by a red flare).
