In the following we describe the session file configuration. Specifically we consider the sections
under the tag <CONDITIONS>
in the session (.xml) file.
Under this section it is possible to set the parameters of the simulation.
TimeStep
is the time-step we want to use;
FinTime
is the final physical time at which we want our simulation to stop;
NumSteps
is the equivalent of FinTime
but instead of specifying the physical final
time we specify the number of time-steps;
IO_CheckSteps
sets the number of steps between successive checkpoint files;
IO_InfoSteps
sets the number of steps between successive info stats are printed
to screen;
Gamma
ratio of the specific heats. Default value = 1.4;
pInf
farfield pressure (i.e. p∞). Default value = 101325 Pa;
rhoInf
farfield density (i.e. ρ∞). Default value = 1.225 Kg∕m3;
TInf
farfield temperature (i.e. T∞). Default value = 288.15 K;
Twall
temperature at the wall when isothermal boundary conditions are employed
(i.e. Tw). Default value = 300.15K;
uint
farfield X-component of the velocity (i.e. u∞). Default value = 0.1 m∕s;
vInf
farfield Y -component of the velocity (i.e. v∞). Default value = 0.0 m∕s;
wInf
farfield Z-component of the velocity (i.e. w∞). Default value = 0.0 m∕s;
mu
dynamic viscosity (i.e. μ∞). Default value = 1.78e-05 Pas;
Pr
Prandtl number. Default value = 0.72;
thermalConductivity
thermal conductivity (i.e. κ∞). Default value = 0.0257
W∕(Km);
Under this section it is possible to set the solver information.
EQType
is the tag which specify the equations we want solve:
NavierStokesCFE
(Compressible Navier-Stokes equations);
EulerCFE
(Compressible Euler equations).Projection
is the type of projection we want to use:
DisContinuous
.AdvectionType
is the advection operator we want to use:
WeakDG
(classical DG in weak form);
FRDG
(Flux-Reconstruction recovering nodal DG scheme);
FRSD
(Flux-Reconstruction recovering a spectral difference (SD) scheme);
FRHU
(Flux-Reconstruction recovering Huynh (G2) scheme);
FRcmin
(Flux-Reconstruction with c = cmin);
FRcinf
(Flux-Reconstruction with c = ∞).DiffusionType
is the diffusion operator we want to use:
WeakDG
(classical DG in weak form);
FRDG
(Flux-Reconstruction recovering nodal DG scheme);
FRSD
(Flux-Reconstruction recovering a spectral difference (SD) scheme);
FRHU
(Flux-Reconstruction recovering Huynh (G2) scheme);
FRcmin
(Flux-Reconstruction with c = cmin);
FRcinf
(Flux-Reconstruction with c = ∞).TimeIntegrationMethod
is the time-integration scheme we want to use. Note that only
an explicit discretisation is supported:
ForwardEuler
;
RungeKutta2_ImprovedEuler
;
ClassicalRungeKutta4
.UpwindType
is the numerical interface flux (i.e. Riemann solver) we want to use for the
advection operator:
AUSM0
;
AUSM1
;
AUSM2
;
AUSM3
;
Average
;
ExactToro
;
HLL
;
HLLC
;
LaxFriedrichs
;
Roe
.ProblemType
is the problem type we want to solve. This tag is supported for solving ad
hoc problems such as the isentropic vortex or the Ringleb flow.
General
;
IsentropicVortex
;
RinglebFlow
;ViscosityType
is the viscosity type we want to use:
Constant
(Constant viscosity);
Variable
(Variable viscosity through the Sutherland’s law.);
In this section we can specify the boundary conditions for our problem. First we need
to define the variables under the section VARIABLES
. For a 1D problem we have:
For a 2D problem we have
For a 3D problem we have:
After having defined the variables depending on the dimensions of the problem we want to solve it is necessary to specify the boundary regions on which we want to define the boundary conditions:
Finally we can specify the boundary conditions on the regions specified under BOUNDARYREGIONS
.
In the following some examples for a 2D problem:
Under the two following sections it is possible to define the initial conditions and the exact solution (if existent).