Source code for jaxfluids.solvers.riemann_solvers.HLL

#*------------------------------------------------------------------------------*
#* JAX-FLUIDS -                                                                 *
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#* A fully-differentiable CFD solver for compressible two-phase flows.          *
#* Copyright (C) 2022  Deniz A. Bezgin, Aaron B. Buhendwa, Nikolaus A. Adams    *
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#* GNU General Public License for more details.                                 *
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#* CONTACT                                                                      *
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#* deniz.bezgin@tum.de // aaron.buhendwa@tum.de // nikolaus.adams@tum.de        *
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#* Munich, April 15th, 2022                                                     *
#*                                                                              *
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from typing import Callable

import jax
import jax.numpy as jnp

from jaxfluids.materials.material_manager import MaterialManager
from jaxfluids.solvers.riemann_solvers.riemann_solver import RiemannSolver
from jaxfluids.utilities import get_fluxes_xi

[docs] class HLL(RiemannSolver): """HLL Riemann Solver by Harten, Lax and van Leer Harten et al. 1983 """ def __init__(self, material_manager: MaterialManager, signal_speed: Callable) -> None: super().__init__(material_manager, signal_speed)
[docs] def solve_riemann_problem_xi(self, primes_L: jnp.ndarray, primes_R: jnp.ndarray, cons_L: jnp.ndarray, cons_R: jnp.ndarray, axis: int, **kwargs) -> jnp.ndarray: fluxes_left = get_fluxes_xi(primes_L, cons_L, axis) fluxes_right = get_fluxes_xi(primes_R, cons_R, axis) speed_of_sound_left = self.material_manager.get_speed_of_sound(p = primes_L[4], rho = primes_L[0]) speed_of_sound_right = self.material_manager.get_speed_of_sound(p = primes_R[4], rho = primes_R[0]) wave_speed_simple_L, wave_speed_simple_R = self.signal_speed(primes_L[axis+1], primes_R[axis+1], speed_of_sound_left, speed_of_sound_right, rho_L = primes_L[0], rho_R = primes_R[0], p_L = primes_L[4], p_R = primes_R[4], gamma = self.material_manager.gamma) wave_speed_left = jnp.minimum( wave_speed_simple_L, 0.0 ) wave_speed_right = jnp.maximum( wave_speed_simple_R, 0.0 ) fluxes_xi = (wave_speed_right * fluxes_left - wave_speed_left * fluxes_right + wave_speed_left * wave_speed_right * ( cons_R - cons_L ) ) / ( wave_speed_right - wave_speed_left + self.eps) return fluxes_xi