Changes between Version 16 and Version 17 of PhysicsDataExplained
- Timestamp:
- 06/09/11 13:07:09 (14 years ago)
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PhysicsDataExplained
v16 v17 7 7 This contains only one namelist: {{{PhysicsData}}}. 8 8 9 == A Note On Extraneous {{{PhysicsData}}} Members==9 === A Note On Extraneous {{{PhysicsData}}} Members === 10 10 11 11 Some of the parameters in the {{{PhysicsData}}} namelist do not currently serve any purpose. Most of these physical parameters were originally used in features that we have not yet ported over from AstroBEAR 1.0. They were left in {{{PhysicsData}}} against the day that we do get all those features moved over, but do not currently have any effect on the code. … … 15 15 [[BR]] 16 16 17 == General Physical Parameters == 18 17 19 * '''''{{{gamma:}}}''''' The constant ideal gas value of [[latex($\gamma$)]]. AstroBEAR generally assumes that the gases within the problem domain are monatomic, so [[latex($\gamma$)]] should be {{{1.6667}}} for non-isothermal problems. For isothermal problems we use {{{1.001}}}. Normally [[latex($\gamma_{isothermal} = 1$)]], but a [[latex($\gamma$)]] of exactly 1 is hard for our solvers to process, so we just get as close to 1 as we can. 18 20 19 * '''''{{{Xmu:}}}''''' The mean molecular weight of the gas. Generally specified to be 1.0 for hydrogen. 21 * '''''{{{Xmu:}}}''''' The mean molecular weight of the gas. This is sometimes used in conjunction with the mass of a hydrogen atom to determine the number density and temperature scales. A value of 1.0 is usually used for atomic hydrogen, or 0.5 for molecular hydrogen. 22 23 * '''''{{{MinTemp:}}}''''' Sets a minimum temperature within the domain. This should be set to 0.0 if there is no cooling. If there is cooling, then start by setting it to something low, in the 10^-10^ to 10^-6^ range. If this parameter is set too high, then it could wind up injecting extra thermal energy into the system. 20 24 21 25 [[BR]] 22 26 23 == = Description of various scaling parameters ===27 == Description of various scaling parameters == 24 28 MUST be present if cooling, radiation force, or gravity are switched on! 25 29 More information can be found at CalcGlobalScale and the .pdf link at the bottom of that page.
