ANSYS CFX

ANSYS CFX is a robust CFD code allowing 2D and 3D steady-state and unsteady simulations in areas of complex geometry using unstructured grids and multiple processors. The code is capable of modeling various physical phenomena, such as heat and mass transfer, radiation, turbulence, thermal convection etc. The code is extendable – it allows implementing additional physics by introducing additional variables and transport equations for them (with boundary conditions). Transport equations for gas and plasma energy and momentum; with simultaneous conjugated heat transfer solution in the solid parts of the system, including cathode, anode, and enclosure walls can be solved in complex geometry. This approach was tested for several applications including Analysis of ITER Diagnostics Port First Wall cooling system. We implemented a set of boundary conditions that allowed simulations of quaisneutral plasma, where sheath boundary conditions were implemented as plasma surface interface.

Based on such approach a self-consistent model of the arc was developed consisting of the fluid model of gas and plasma coupled to models of heat transfer and current flow in the electrodes. Surface physics was taken into account at the plasma-electrodes interfaces, including ablation/deposition of the carbon material, electron emission, recombination of ions and radiation (including mutual radiation of the electrodes). Effects of the space-charge limited sheathes were also taken into account as boundary conditions at the plasma-electrode interfaces.