E) with hot neutrals #7
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Trying to get model closer to Horsten thesis (2019). The net effect of these changes is to: - Increase heat conduction by 5/3 - Increase heat advection by 5/3 - Increase viscosity by 5/2 - Add viscous heating The atomic rates used in diffusion, viscosity, and heat conduction coefficients are still different from Horsten 2019.
Convert from viscous heating power to rate of change of pressure.
Intended to be similar to Wim Van Uytven et al "Assessment of advanced fluid neutral models for the neutral atoms in the plasma edge and application in ITER geometry" Nucl. Fusion 62 (2022) 086023 Significantly slows convergence; may be something wrong in implementation.
Previous commit accidentally reversed the sign of the cross-field particle flow, resulting in very poor convergence. Flux limits are now enabled by default.
- This is for testing and the Rnn term may be removed permanently later - The AFN limiters don't have this.
- For testing
Check if float option is < 0 rather than equal to -1. Remove some unused and commented-out code.
Flux limited particle flux is used in momentum flux before the momentum flux is limited. Particle flux limiter applied to advection of momentum and pressure.
Applies a time-averaging to the flux limit factors, with a given timescale. Doesn't appear to have much benefit in quick tests, but left in and turned off by default. May be removed if it really doesn't do anything useful.
Following email from Wim Van Uyten, the flux limiters have been modified: Parallel and perpendicular fluxes are used in calculating the flux limiter, but only diffusive terms are modified by flux limiter factors: - Cross-field advection due to v_perp = - D * Grad_perp(log(Pn)) - Parallel and perpendicular viscosity, - eta_n * Grad(Vn) - Parallel and perpendicular heat conduction, -kappa_n * Grad(Tn) Limiters are chained, so the cross-field particle flux limiter is used when calculating the viscosity and heat conduction limiters.
Changes after talk with Wim. Limiters now calculated from diffusive terms only and only affect diffusive terms. Also kappa and eta now correctly include particle flux limitation.
- Floor prevents CX turning off. problem for CX with density channel
- When the hot neutrals approach the cold neutral temperature, wall reflection no longer turns them into cold neutrals. Prevents hot neutrals from becoming colder than cold neutrals by the wall.
- Allows you to bias the CX sources towards either atom1 or atom2 which is particularly useful for the hot neutral model
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