64 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Norwegian University of Science and TechnologyNO18 papers
- KTH Royal Institute of TechnologySE11 papers
- Stockholm UniversitySE11 papers
- Joint Institute for Laboratory AstrophysicsUS7 papers
- Laboratory for Atmospheric and Space PhysicsUS7 papers
- University of Colorado BoulderUS7 papers
- Ben-Gurion University of the NegevIL6 papers
- Bolin Centre for Climate ResearchSE6 papers
- Swedish e-Science Research CentreSE5 papers
- ABB (Sweden)SE3 papers
- Delft University of TechnologyNL3 papers
- Nordic Institute for Theoretical PhysicsSE3 papers
34 papers
Expert Elicitation on Wind Farm Control
J. W. van Wingerden, P. A. Fleming, T. Göçmen +13
Wind farm control is an active and growing field of research in which the control actions of individual turbines in a farm are coordinated, accounting for inter-turbine aerodynamic…
Nonequilibrium thermodynamics of surfaces captures the energy conversions in a shockwave
Bjørn Hafskjold, Dick Bedeaux, Signe Kjelstrup +1
The local entropy production in a shock wave was analysed in the framework of non-equilibrium thermodynamics (NET) of surfaces. We show that the thermodynamic state variables in th…
3D fluid modeling of positive streamer discharges in air with stochastic photoionization
Robert Marskar
Streamer discharges are thin plasma channels that precede lightning and sparks. They usually evolve in bundles as stochastic tree-like structures and are inherently difficult to mo…
Hydrothermal Scheduling in the Continuous-Time Framework
Christian Øyn Naversen, Arild Helseth, Bosong Li +3
Continuous-time optimization models have successfully been used to capture the impact of ramping limitations in power systems. In this paper, the continuous-time framework is adapt…
Photoionization model for streamer propagation mode change in simulation model for streamers in dielectric liquids
I Madshaven, OL Hestad, M Unge +2
Radiation is important for the propagation of streamers in dielectric liquids. Photoionization is a possibility, but the effect is difficult to differentiate from other contributio…
Thermodynamic properties of the 3D Lennard-Jones/spline model
Bjørn Hafskjold, Karl Patrick Travis, Amanda Bailey Hass +3
The Lennard-Jones (LJ) spline potential is a truncated LJ potential such that both the pair potential and the force continuously approach zero at . We present a…
Design of experiments aided holistic testing of cyber-physical energy systems
Arjen van der Meer, Cornelius Steinbrink, Kai Heussen +6
The complex and often safety-critical nature of cyber-physical energy systems makes validation a key challenge in facilitating the energy transition, especially when it comes to th…
A consistent reduction of the two-layer shallow-water equations to an accurate one-layer spreading model
Eirik Holm Fyhn, Karl Yngve Lervåg, Åsmund Ervik +1
The gravity-driven spreading of one fluid in contact with another fluid is of key importance to a range of topics. To describe these phenomena, the two-layer shallow-water equation…
Conductivity and capacitance of streamers in avalanche model for streamer propagation in dielectric liquids
I Madshaven, OL Hestad, M Unge +2
Propagation of positive streamers in dielectric liquids, modeled by the electron avalanche mechanism, is simulated in a needle-plane gap. The streamer is modeled as an RC-circuit w…
Convergence properties of detonation simulations
Chengeng Qian, Cheng Wang, JianNan Liu +3
We present a high-resolution convergence study of detonation initiated by a temperature gradient in a stoichiometric hydrogen-oxygen mixture using the Pencil Code and compare with…
Collision fluctuations of lucky droplets with superdroplets
Xiang-Yu Li, Bernhard Mehlig, Gunilla Svensson +2
It was previously shown that the superdroplet algorithm for modeling the collision-coalescence process can faithfully represent mean droplet growth in turbulent clouds. But an open…
Adaptive multiscale methods for 3D streamer discharges in air
Robert Marskar
We discuss spatially and temporally adaptive implicit-explicit (IMEX) methods for parallel simulations of three-dimensional fluid streamer discharges in atmospheric air. We examine…
An adaptive Cartesian embedded boundary approach for fluid simulations of two- and three-dimensional low temperature plasma filaments in complex geometries
Robert Marskar
We review a scalable two- and three-dimensional computer code for low-temperature plasma simulations in multi-material complex geometries. Our approach is based on embedded boundar…
Condensational and collisional growth of cloud droplets in a turbulent environment
Xiang-Yu Li, Axel Brandenburg, Gunilla Svensson +3
We investigate the effect of turbulence on the combined condensational and collisional growth of cloud droplets by means of high resolution direct numerical simulations of turbulen…
Treatment of solid objects in the Pencil Code using an immersed boundary method and overset grids
Jørgen R. Aarnes, Tai Jin, Chaoli Mao +3
Two methods for solid body representation in flow simulations available in the Pencil Code are the immersed boundary method and overset grids. These methods are quite different in…
Varying the forcing scale in low Prandtl number dynamos
A. Brandenburg, N. E. L. Haugen, Xiang-Yu Li +1
Small-scale dynamos are expected to operate in all astrophysical fluids that are turbulent and electrically conducting, for example the interstellar medium, stellar interiors, and…
Cloud-droplet growth due to supersaturation fluctuations in stratiform clouds
Xiang-Yu Li, Gunilla Svensson, Axel Brandenburg +1
Condensational growth of cloud droplets due to supersaturation fluctuations is investigated by solving the hydrodynamic and thermodynamic equations using direct numerical simulatio…
High-order overset grid method for detecting particle impaction on a cylinder in a cross flow
J. R. Aarnes, N. E. L. Haugen, H. I. Andersson
An overset grid method was used to investigate the interaction between a particle-laden flow and a circular cylinder. The overset grid method was implemented in the Pencil Code , a…
Simulation model for the propagation of second mode streamers in dielectric liquids using the Townsend--Meek criterion
I. Madshaven, P. -O. Åstrand, O. L. Hestad +3
A simulation model for second mode positive streamers in dielectric liquids is presented. Initiation and propagation is modeled by an electron-avalanche mechanism and the Townsend-…
Effect of turbulence on collisional growth of cloud droplets
Xiang-Yu Li, A. Brandenburg, G. Svensson +3
We investigate the effect of turbulence on the collisional growth of um-sized droplets through high- resolution numerical simulations with well resolved Kolmogorov scales, assuming…
Simulation-based Validation of Smart Grids - Status Quo and Future Research Trends
Cornelius Steinbrink, Sebastian Lehnhoff, Sebastian Rohjans +22
Smart grid systems are characterized by high complexity due to interactions between a traditional passive network and active power electronic components, coupled using communicatio…
Multipoint Radiation Induced Ignition of Dust Explosions: Turbulent Clustering of Particles and Increased Transparency
M. Liberman, N. Kleeorin, I. Rogachevskii +1
It is known that unconfined dust explosions consist of a relatively weak primary (turbulent) deflagrations followed by a devastating secondary explosion. The secondary explosion ma…
Mechanism of unconfined dust explosions: turbulent clustering and radiation-induced ignition
M. Liberman, N. Kleeorin, I. Rogachevskii +1
It is known that unconfined dust explosions typically starts off with a relatively weak primary flame followed by a severe secondary explosion. We show that clustering of dust part…
A multi-phase ferrofluid flow model with equation of state for thermomagnetic pumping and heat transfer
Eskil Aursand, Magnus Aa. Gjennestad, Karl Yngve Lervåg +1
A one-dimensional multi-phase flow model for thermomagnetically pumped ferrofluid with heat transfer is proposed. The thermodynamic model is a combination of a simplified particle…