# Interaction of large scale flow structures with gyrokinetic turbulence

## Related Articles

- Comparisons of gyrofluid and gyrokinetic simulations*. Parker, S.E.; Dorland, W.; Santoro, R.A.; Beer, M.A.; Liu, Q.P.; Lee, W.W.; Hammett, G.W. // Physics of Plasmas;May94, Vol. 1 Issue 5, p1461
Discusses detailed comparisons of the gyrokinetic and gyrofluid models that show promise for large scale simulations of tokamak microturbulence. Agreement between turbulent and coherent nonlinear slab comparisons in terms of the ion heat flux; Presence of self-generated poloidal shear flows in...

- Neutral diffusion and anomalous effects on ion flow shear. Fulop, T.; Catto, Peter J.; Helander, P. // Physics of Plasmas;Sep98, Vol. 5 Issue 9, p3398
Examines the effects of neutral diffusion on ion flow shear. Abundance of neutral atoms in tokamaks; Comparison between neutral and plasma density; Influence of ion-neutral charge exchange on diffusion momentum.

- Expansion of shear flow and vortex merger in a two-dimensional turbulent mixing layer. Chiueh, Tzihong // Physics of Fluids B: Plasma Physics;Jun89, Vol. 1 Issue 6, p1163
A theoretical model is presented to describe the shear flow evolution via interplay of vortex pairing, unstable collective excitation, and turbulent diffusion. An integrable nonlinear ordinary differential equation governing the mean flow-turbulence evolution is derived. The equation does not...

- Zonal flows and transport in ion temperature gradient turbulence. Dastgeer, Sheikh; Mahajan, Sangeeta; Weiland, Jan // Physics of Plasmas;Dec2002, Vol. 9 Issue 12, p4911
The nonlinear "Dimits" upshift found in gyrokinetic Cyclone simulations has been recovered in simulations using a reactive fluid model. Its magnitude is in good agreement with the gyrokinetic simulations. The upshift is caused by resonant excitation of zonal flows which also provide an absorbing...

- Neutral diffusion and anomalous effects on collisional ion flow shear in tokamaks. Fulop, T.; Catto, Peter J. // Physics of Plasmas;Nov98, Vol. 5 Issue 11, p3969
Examines the effects of neutral diffusion on collisional ion flow shear in tokamaks. Role of neutrals in the modification of the standard Pfirsch-Schluter expression for the parallel ion flow; Domination of the direct modification of the ion distribution function at order unity aspect ratios;...

- Beyond paradigm: Turbulence, transport, and the origin of the radial electric field in low to... Moyer, R.A.; Burrell, K.H.; Carlstrom, T.N.; Coda, S.; Conn, R.W.; Doyle, E.J.; Gohil, P.; Groebner, R.J.; Kim, J.; Lehmer, R.; Peebles, W.A.; Porkolab, M.; Rettig, C.L.; Rhodes, T.L.; Seraydarian, R.P.; Stockdale, R.; Thomas, D.M.; Tynan, G.R.; Watkins, J.G. // Physics of Plasmas;Jun95, Vol. 2 Issue 6, p2397
Examines the paradigm of shear suppression of turbulence as the mechanism for the low to high (L to H) confinement mode transition, by quantitative comparison of the predictions of the paradigm with experimental results from the DIII-D tokamak. Triggering of a VxB rotation due to the L to H...

- Steady state drift vortices in plasmas with shear flow in equilibrium. Chakrabarti, Nikhil // Physics of Plasmas;Jan1999, Vol. 6 Issue 1, p417
Presents an exact steady state solution for the Hasegawa-Mima equation with shear flow in equilibrium. Sameness of the phase velocity of the vortex to the diamagnetic drift velocity; Evidence that sheared poloidal rotation of tokamak can suppress the level of turbulence.

- Flow shear induced fluctuation suppression in finite aspect ratio shaped tokamak plasma. Hahm, T. S.; Burrell, K. H. // Physics of Plasmas;May95, Vol. 2 Issue 5, p1648
Studies the suppression of turbulence by the ExB flow shear and parallel flow shear in an arbitrary shape finite aspect ratio tokamak plasma using the two point nonlinear analysis previously utilized in high aspect ratio tokamak plasma. Role of the ExB flow shear in the suppression of...

- The stadium shear device: A novel apparatus for studying dense granular flows. Miller, Tom; Rognon, Pierre; Einav, Itai // AIP Conference Proceedings;Jun2013, Vol. 1542 Issue 1, p483
We present a new experimental apparatus for studying dense granular flows. The device is able to produce plane shear flow over large deformations by utilising a novel stadium geometry. Both the grainscale kinematics and the macroscopic stresses can be captured. We report results from a set of...