Changes between Version 24 and Version 25 of FluxLimitedDiffusion


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Timestamp:
03/20/13 11:57:25 (12 years ago)
Author:
Jonathan
Comment:

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  • FluxLimitedDiffusion

    v24 v25  
    182182
    183183
     184If we ignore the change in the Planck function due to heating during the implicit solve, it is equivalent to replacing the term with [[latex(\psi \phi^n_i e^{n+1}_i)]] with [[latex(\psi \phi^n_i e^n_i)]] in which case the equations simplify to
     185
     186||   [[latex(\left [ 1 + \psi \left( \alpha^n_{i+1/2} + \alpha^n_{i-1/2} + \epsilon^n_i \right ) \right ] E^{n+1}_i - \left ( \psi \alpha^n_{i+1/2} \right ) E^{n+1}_{i+1} - \left ( \psi \alpha^n_{i-1/2} \right ) E^{n+1}_{i-1} =\left [ 1 - \bar{\psi} \left( \alpha^n_{i+1/2} + \alpha^n_{i-1/2} + \epsilon^n_i \right ) \right ] E^n_i+\phi^n_i e^n_i + \theta^n_i)]]   ||
     187||   [[latex(\left (1 \right ) e^{n+1}_i = \left ( \psi \epsilon^n_i \right )E^{n+1}_i + \left ( 1 - \phi^n_i \right ) e^n_i + \left ( \bar{\psi} \epsilon^n_i \right ) E^n_i-\theta^i_n )]]   ||
     188
     189
    184190
    185191Clearly the second equation is trivial to solve after the first system of equations has been solved.  So if we treat the temperature as being constant we can calculate the local heating/cooling due to radiative emission/absorption