Editing Talk:1851: Magnetohydrodynamics

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{{w|Fluid_dynamics|Hydrodynamics}} is the study of fluids, not just liquids, as it includes solids (though usually plain hydrodynamics or radiation-hydrodynamics is used in explosion simulations, e.g. dynamite or something) as well as liquids and gases (again rad-hydro is used here lots in stellar explosions) and things that are sort of in-between or not really SL or G. Hydrodynamics is regularly treated numerically using simulations, you can't solve it analytically (unless someone claims that prize) so you integrate it {{w|https://Numerical_integration|bit}} by tiny bit, loads of times. MHD adds a layer of difficulty as you might expect, it's used to describe interstellar gas where the magnetic bits gets important (e.g. stellar winds, the top few layers of the sun [https://arxiv.org/pdf/1112.5925.pdf (Solar Vortex Tubes!)]), MHD is widely used in the {{w|Magnetic_confinement_fusion|Magnetic Confinement Fusion}} community to simulate plasma flow/turbulence/horror in {{w|Tokamak|Tokamak}} or {{w|Wendelstein_7-X|Stellerator}} (and weirder) devices, it's pretty difficult to get right, hence very little fusion yet in these devices. Though it is worth noting that it is actually a simplification of particle kinetic behaviour and that it can't describe a lot of really fast time dynamics, or some of the more odd {{w|Plasma_stability|instabilities}}, so some poor sods (me sadly) have to use the {{w|Particle-in-cell|particle}} kinetic codes to simulate their plasmas.[[unsigned ip|127.0.0.1|20:39, 17 June 2017 (UTC)]]{{unsigned|Xoanon}}
 
{{w|Fluid_dynamics|Hydrodynamics}} is the study of fluids, not just liquids, as it includes solids (though usually plain hydrodynamics or radiation-hydrodynamics is used in explosion simulations, e.g. dynamite or something) as well as liquids and gases (again rad-hydro is used here lots in stellar explosions) and things that are sort of in-between or not really SL or G. Hydrodynamics is regularly treated numerically using simulations, you can't solve it analytically (unless someone claims that prize) so you integrate it {{w|https://Numerical_integration|bit}} by tiny bit, loads of times. MHD adds a layer of difficulty as you might expect, it's used to describe interstellar gas where the magnetic bits gets important (e.g. stellar winds, the top few layers of the sun [https://arxiv.org/pdf/1112.5925.pdf (Solar Vortex Tubes!)]), MHD is widely used in the {{w|Magnetic_confinement_fusion|Magnetic Confinement Fusion}} community to simulate plasma flow/turbulence/horror in {{w|Tokamak|Tokamak}} or {{w|Wendelstein_7-X|Stellerator}} (and weirder) devices, it's pretty difficult to get right, hence very little fusion yet in these devices. Though it is worth noting that it is actually a simplification of particle kinetic behaviour and that it can't describe a lot of really fast time dynamics, or some of the more odd {{w|Plasma_stability|instabilities}}, so some poor sods (me sadly) have to use the {{w|Particle-in-cell|particle}} kinetic codes to simulate their plasmas.[[unsigned ip|127.0.0.1|20:39, 17 June 2017 (UTC)]]{{unsigned|Xoanon}}
 
:To make things more unpleasant, several of the assumptions MHD uses don't apply to most fusion plasmas (particularly the collisionality).[[Special:Contributions/108.162.215.160|108.162.215.160]]
 
:To make things more unpleasant, several of the assumptions MHD uses don't apply to most fusion plasmas (particularly the collisionality).[[Special:Contributions/108.162.215.160|108.162.215.160]]
βˆ’
 
βˆ’
Or it could just be greased lightning.[[Special:Contributions/172.68.132.195|172.68.132.195]] 17:54, 11 April 2021 (UTC)
 

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