83 citations · 483 across the 19 of their papers we have counts for
19 papers
Validation of Hermes-3 turbulence simulations against the TCV-X21 diverted L-mode reference case
B D Dudson, M Kryjak, H Muhammed +1
Electrostatic flux-driven turbulence simulations with the Hermes-3 code are performed in TCV L-mode conditions in forward and reversed toroidal field configurations, and compared t…
Neural operator surrogate models of plasma edge simulations: feasibility and data efficiency
N. Carey, L. Zanisi, S. Pamela +7
The inclusion of high-fidelity simulations of SOL turbulence and transient MHD events such as ELMs in highly iterative applications remains computationally prohibitive, limiting th…
Data efficiency and long term prediction capabilities for neural operator surrogate models of core and edge plasma codes
N. Carey, L. Zanisi, S. Pamela +4
Simulation-based plasma scenario development, optimization and control are crucial elements towards the successful deployment of next-generation experimental tokamaks and Fusion po…
Hermes-3: Multi-component plasma simulations with BOUT++
Ben Dudson, Mike Kryjak, Hasan Muhammed +2
A new open source tool for fluid simulation of multi-component plasmas is presented, based on a flexible software design that is applicable to scientific simulations in a wide rang…
Comparing Two- and Three-Dimensional Models of Scrape-Off-Layer Turbulent Transport
T. E. G. Nicholas, J. Omotani, F. Riva +2
There exists a large body of previous work using reduced two-dimensional models of the SOL, which model fluctuations in the drift-plane but approximate parallel transport with effe…
Numerical turbulence simulations of intermittent fluctuations in the scrape-off layer of magnetized plasmas
Gregor Decristoforo, Audun Theodorsen, John Omotani +2
Intermittent fluctuations in the boundary of magnetically confined plasmas are investigated by numerical turbulence simulations of a reduced fluid model describing the evolution of…
Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications
Jonathan Peter Brodrick, Robert J. Kingham, Michael M. Marinak +10
Three models for nonlocal electron thermal transport are here compared against Vlasov-Fokker-Planck (VFP) codes to assess their accuracy in situations relevant to both inertial fus…
Overview of recent physics results from MAST
A Kirk, J Adamek, RJ Akers +160
New results from MAST are presented that focus on validating models in order to extrapolate to future devices. Measurements during start-up experiments have shown how the bulk ion…
Dynamics of 3D isolated thermal filaments
N. R. Walkden, L. Easy, F. Militello +1
Simulations have been carried out to establish how electron thermal physics, introduced in the form of a dynamic electron temperature, affects isolated filament motion and dynamics…
Plasma rotation from momentum transport by neutrals in tokamaks
John Omotani, István Pusztai, Tünde Fülöp
Neutral atoms can strongly influence the intrinsic rotation and radial electric field at the tokamak edge. Here, we present a framework to investigate these effects when the neutra…
Verification of BOUT++ by the Method of Manufactured Solutions
Ben Dudson, Jens Madsen, John Omotani +3
BOUT++ is a software package designed for solving plasma fluid models. It has been used to simulate a wide range of plasma phenomena ranging from linear stability analysis to 3D pl…
Investigation of the Effect of Resistivity on Scrape Off Layer Filaments using Three Dimensional Simulations
Luke Easy, Fulvio Militello, John Omotani +2
The propagation of filaments in the Scrape Off Layer (SOL) of tokamaks largely determine the plasma profiles in the region. In a conduction limited SOL, parallel temperature gradie…
3D Simulations of Plasma Filaments in the Scrape Off Layer: A Comparison with Models of Reduced Dimensionality
Luke Easy, Fulvio Militello, John Omotani +5
This paper presents simulations of isolated 3D filaments in a slab geometry obtained using a 3D reduced fluid code. First, systematic scans were performed to investigate how the dy…
BOUT++: Recent and current developments
B. D. Dudson, A. Allen, G. Breyiannis +12
BOUT++ is a 3D nonlinear finite-difference plasma simulation code, capable of solving quite general systems of PDEs, but targeted particularly on studies of the edge region of toka…
Non-local parallel transport in BOUT++
J. T. Omotani, B. D. Dudson, E. Havlickova +1
Non-local closures allow kinetic effects on parallel transport to be included in fluid simulations. This is especially important in the scrape-off layer, but to be useful there the…
Non-local approach to kinetic effects on parallel transport in fluid models of the scrape-off layer
John Omotani, Ben Dudson
By using a non-local model, fluid simulations can capture kinetic effects in the parallel electron heat-flux better than is possible using flux limiters in the usual diffusive mode…
I've Got the World on a Brane
John Omotani
This thesis treats several topics in the study of extra-dimensional models of the world, concerning Heterotic M-Theory and the dynamics of branes. We describe a reduction to five d…
Reducing heterotic M-theory to five dimensional supergravity on a manifold with boundary
Ian G. Moss, John T. Omotani, Paul M. Saffin
This paper constructs the reduction of heterotic -theory in eleven dimensions to a supergravity model on a manifold with boundary in five dimensions using a Calabi-Yau three-fol…
Colliding branes and big crunches
John Omotani, Paul M. Saffin, Jorma Louko
We examine the global structure of colliding domain walls in AdS spacetime and come to the conclusion that singularities forming from such collisions are of the big-crunch type rat…