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SGS turbulence model: variational multiscale dynamic model

New simulation technologies for solar simulations. Alan Wray, NASA/AMES. SGS turbulence model: variational multiscale dynamic model Improved version of the usual dynamic Smagorinsky Newly developed radiation model: M1 radiative model

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SGS turbulence model: variational multiscale dynamic model

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  1. New simulation technologies for solar simulations Alan Wray, NASA/AMES • SGS turbulence model:variational multiscale dynamic model • Improved version of the usual dynamic Smagorinsky • Newly developed radiation model: M1 radiative model • This model provides accuracy near that of full RTE solution at much lower cost • Alternately, implement easily parallelizable, highly accurate full RTE solver

  2. Turbulence model test 1: decay of kinetic energy DNS: blackStandard dynamic model: blueStatic multiscale model: redDynamic multiscale model: green

  3. Turbulence model test 2: decay of total enstrophy DNS: blackStandard dynamic model: blueStatic multiscale model: redDynamic multiscale model: green

  4. Comparison of M1 with DRTE and previous models: Radiative temperature (K) x

  5. Comparison of M1 with DRTE: Radiative flux anisotropy

  6. Parallelizing full RTE: Sampling solid angle 18 rays, parallelizable by planes

  7. Improving the solution of the RTE: integration accuracy Piecewise exact exact 2nd order implicit Feautrier distance Intensity 4000 point solution distance

  8. Piecewise exact exact 2nd order implicit Feautrier Piecewise exact exact 2nd order implicit Feautrier Piecewise exact exact 2nd order implicit Feautrier Intensity 1000 point solution 1000 point solution distance Intensity 250 point solution distance

  9. Piecewise exact exact 2nd order implicit Feautrier Intensity 60 point solution distance

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