public function atl_LinearEuler_2d_physFlux(state, LinearEuler, iDir) result(flux)
Function for physical flux of the LinearEuler equation F, 1D?
Since it is 1d, there need to be passed the correct background velocity (u0
for F - flux in x direction, v0 for G - flux in y direction, w0 for H -
flux in z direction)
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