Relaxation

2007-11-30T12:01:48Z

192.168.23.108:

Relaxation schemes are used in [[MOHID Water]] to relax computed solutions to a reference solution. The standard method follows the equation:

<math> \frac{\partial \phi}{\partial t} = \frac{ \phi_{ref} - \phi}{\tau}</math>

where <math>\phi</math> is the relaxed variable, <math>\phi_{ref}</math> is the reference solution and <math>\tau</math> relaxation time scale.

In MOHID Water, the reference fields and the relaxation time scales are read and handled by [[Module Assimilation]]. The relaxation algorithm itself is implemented in [[Module Hydrodynamic]] and [[Module WaterProperties]] to apply the relaxation scheme to properties such as velocity U, velocity V, water level, temperature, salinity, etc. It is normally applied in the boundary condition computation, usually when [[nesting models]] or using a climatological reference field, via the definition of a "sponge layer" around the open boundary. However it can also be applied to the entire simulation domain.

[[Category: MOHID Water]]

MohidWiki - User contributions [en]

Relaxation