SGS turbulence model: variational multiscale dynamic model

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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

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Turbulence model test 1 decay of kinetic energy
DNS
black Standard dynamic model blueStatic
multiscale model red Dynamic
multiscale model green
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Turbulence model test 2 decay of total
enstrophy DNS
black Standard dynamic model
blueStatic multiscale model red
Dynamic multiscale model green
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Comparison of M1 with DRTE and previous
models Radiative temperature (K)
x
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Comparison of M1 with DRTE Radiative flux
anisotropy
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Parallelizing full RTE Sampling solid angle
18 rays, parallelizable by planes
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Improving the solution of the RTE integration
accuracy
distance
Intensity
4000 point solution
distance
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Piecewise exact
exact
2nd order implicit
Feautrier
Intensity
1000 point solution
1000 point solution
distance
Intensity
250 point solution
distance
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Intensity
60 point solution
distance