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## DissipationIn physics, ## Additional recommended knowledgeFor example, a wave that loses amplitude is said to Dissipating forces are those which can not be described by Hamiltonian formalism. Loosely speaking, friction and all similar forces which result in decoherency of energy, that is, conversion of coherent or directed energy flow into an indirected or more isotropic distribution of energy. In computational physics, a numerical dissipation is also known as "artificial dissipation" or "artificial diffusion" or "numerical diffusion". They all mean this: when the pure advection equation--which, by definition, is free of dissipation--is solved by a numerical approximation method that reduces the amplitude and changes the shape of the initial wave in a way analogous to a diffusional process, the method is said to contain 'dissipation'. A formal, mathematical definition of dissipation, as commonly used in the mathematical study of measure-preserving dynamical systems, is given in the article ## In river hydrologyDissipation is the process of converting mechanical energy of downward flowing water into thermal and acoustical energy. Various devices are designed in streambeds to reduce the kinetic energy of flowing waters to reduce their erosive potential on banks and river bottoms. Very often these devices look like small waterfalls or cascades, where water flows vertically or over riprap to lose some of its kinetic force. ## See also- Flood control
- Two dimensional gas
## ReferencesCategories: Thermodynamics | Non-equilibrium thermodynamics |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dissipation". A list of authors is available in Wikipedia. |