# -*- coding: utf-8 -*-
from pyfr.solvers.baseadvec import BaseAdvectionElements
class BaseFluidElements(object):
formulations = ['std', 'dual']
privarmap = {2: ['rho', 'u', 'v', 'p'],
3: ['rho', 'u', 'v', 'w', 'p']}
convarmap = {2: ['rho', 'rhou', 'rhov', 'E'],
3: ['rho', 'rhou', 'rhov', 'rhow', 'E']}
dualcoeffs = convarmap
visvarmap = {
2: {'density': ['rho'],
'velocity': ['u', 'v'],
'pressure': ['p']},
3: {'density': ['rho'],
'velocity': ['u', 'v', 'w'],
'pressure': ['p']}
}
@staticmethod
def pri_to_con(pris, cfg):
rho, p = pris[0], pris[-1]
# Multiply velocity components by rho
rhovs = [rho*c for c in pris[1:-1]]
# Compute the energy
gamma = cfg.getfloat('constants', 'gamma')
E = p/(gamma - 1) + 0.5*rho*sum(c*c for c in pris[1:-1])
return [rho] + rhovs + [E]
@staticmethod
def con_to_pri(cons, cfg):
rho, E = cons[0], cons[-1]
# Divide momentum components by rho
vs = [rhov/rho for rhov in cons[1:-1]]
# Compute the pressure
gamma = cfg.getfloat('constants', 'gamma')
p = (gamma - 1)*(E - 0.5*rho*sum(v*v for v in vs))
return [rho] + vs + [p]
[docs]class EulerElements(BaseFluidElements, BaseAdvectionElements):
[docs] def set_backend(self, backend, nscalupts, nonce):
super().set_backend(backend, nscalupts, nonce)
# Register our flux kernel
backend.pointwise.register('pyfr.solvers.euler.kernels.tflux')
# Template parameters for the flux kernel
tplargs = dict(ndims=self.ndims, nvars=self.nvars,
c=self.cfg.items_as('constants', float))
if 'flux' in self.antialias:
self.kernels['tdisf'] = lambda: backend.kernel(
'tflux', tplargs=tplargs, dims=[self.nqpts, self.neles],
u=self._scal_qpts, smats=self.smat_at('qpts'),
f=self._vect_qpts
)
else:
self.kernels['tdisf'] = lambda: backend.kernel(
'tflux', tplargs=tplargs, dims=[self.nupts, self.neles],
u=self.scal_upts_inb, smats=self.smat_at('upts'),
f=self._vect_upts
)