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Direct multiscale coupling of a transport code to gyrokinetic turbulence codesa)
a)Paper DI3 1, Bull. Am. Phys. Soc. 54, 56 (2009).
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10.1063/1.3323082
/content/aip/journal/pop/17/5/10.1063/1.3323082
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/5/10.1063/1.3323082

Figures

Image of FIG. 1.
FIG. 1.

(Left) Cartoon of multiscale space-time grid used in TRINITY. Vertical and horizontal regions represent the radial and time domains, respectively, over which a fine mesh is used to calculate turbulent fluxes. The overlapping regions denote the reduced space-time domain used in TRINITY. These patches, each of which corresponds to a nonlinear gyrokinetic flux tube simulation (right), are grid points in the coarse space-time mesh used to solve the transport equations. The flux tube visualization is taken from a GS2 simulation of electron-scale turbulence in MAST.

Image of FIG. 2.
FIG. 2.

Comparison of steady-state density and temperature profiles constructed from JET shot 19649 by TRANSP (points and dotted lines) with those calculated in TRINITY (solid lines).

Image of FIG. 3.
FIG. 3.

Comparison of experimental (dotted lines) and simulated (solid lines) gradient scale lengths for JET shot 19649.

Image of FIG. 4.
FIG. 4.

Power balance for JET shot 19649. Solid lines are the steady-state, flux surface integrated fluxes calculated in GS2 at the end of the TRINITY simulation. Dotted lines are the volume integrals of the source terms on the right-hand side of Eqs. (2) and (4). In steady state, the solid and dotted lines should match. The small discrepancy near the outer edge of the simulation domain is likely due to numerical inaccuracy in flux calculations at the boundary.

Image of FIG. 5.
FIG. 5.

Radial profiles for fluctuations of density, temperature, and electrostatic potential calculated in GS2 for JET shot 19649. These fluctuations are obtained by time averaging the instantaneous fluctuations computed in GS2 over the steady-state period at the end of the TRINITY simulation.

Image of FIG. 6.
FIG. 6.

Comparison of steady-state density and temperature profiles constructed from JET shot 42982 by TRANSP (points and dotted lines) with those calculated in TRINITY (solid lines).

Image of FIG. 7.
FIG. 7.

Comparison of experimental (dotted lines) and simulated (solid lines) gradient scale lengths for JET shot 42982.

Image of FIG. 8.
FIG. 8.

Radial fluctuation profiles for density, temperature, and electrostatic potential calculated in GS2 for JET shot 42982. The fluctuation levels for this H-mode discharge are generally lower than for the L-mode discharge shown in Fig. 5, but they exhibit the same qualitative trends in their radial profiles.

Image of FIG. 9.
FIG. 9.

Comparison of steady-state density and temperature profiles for TRINITY simulations of JET shot 42982 with different edge temperatures. The dotted lines with points correspond to a simulation using the edge temperatures reported by the experiment and the solid lines correspond to a simulation with the edge temperatures increased by 20%. We see that the increased edge temperatures lead to an increase in the temperatures near the magnetic axis of about 14%.

Image of FIG. 10.
FIG. 10.

Comparison of gradient scale lengths for two different TRINITY simulations of JET shot 42982. Dotted lines correspond to a simulation with edge temperatures taken from the experiment and solid lines correspond to a simulation with the edge temperatures increased by 20%. While the gradient scale length profiles are quite similar, the case with higher edge temperature leads to lower gradient scale lengths near the edge, where the profiles are likely less stiff.

Image of FIG. 11.
FIG. 11.

Radial fluctuation profiles for density, temperature, and electrostatic potential calculated in GS2 for JET shot 42982 with increased edge temperatures. They are quite similar to the case with edge temperatures taken from the experiment.

Image of FIG. 12.
FIG. 12.

Comparison of steady-state density and temperature profiles constructed from ASDEX Upgrade shot 13151 by ASTRA (points and dotted lines) with those calculated in TRINITY (solid lines).

Image of FIG. 13.
FIG. 13.

Comparison of experimental (dotted lines) and simulated (solid lines) gradient scale lengths for ASDEX Upgrade shot 13151.

Tables

Generic image for table
Table I.

Experimental parameters.

Generic image for table
Table II.

Analysis of TRINITY profile fits. and are the relative errors in total and stored energy, respectively. is the rms relative error associated with the subscripted quantity.

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/content/aip/journal/pop/17/5/10.1063/1.3323082
2010-04-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct multiscale coupling of a transport code to gyrokinetic turbulence codesa)
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/5/10.1063/1.3323082
10.1063/1.3323082
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