these simulation numerique et modelisation de l'ecoulement autour ...

An adiabatic model for the flow around a
multi-perforated plate
S. Mendez ∗
CERFACS, 31057 Toulouse, France.
F. Nicoud †
University Montpellier II, CC51, 34095 Montpellier, France
An adiabatic model to account for multi-perforated liners in combustion
chamber flow simulations is described. It is separated into a suction model
and an injection model to reproduce the average effect of effusion cooling on
both sides of the plate. This model has been specifically designed to be used
in industrial full-scale computations of gas turbine combustion chambers,
where effusion cooling is commonly used for cooling the liners. Notably, it
does not impose any minimal resolution at the wall and can be used with
a coarse grid, the real perforated plate being replaced by a homogeneous
boundary condition on which the model is applied. From the analysis of former
wall-resolved Large-Eddy Simulations (LES), two versions of the model
are derived with simple assumptions: one conserves the spatially-averaged
velocity at the wall and the other conserves the wall fluxes. Two series of
validations are proposed: a priori tests, where the model is compared with
wall-resolved LES data and a posteriori tests, where an experimental test
rig is computed replacing the perforated plate of the experiment by the two
models proposed in the paper. The model conserving spatially-averaged velocity
at the wall imposes low velocity in the near-wall region, providing
an unrealistic flow structure. On the other hand, the model conserving
the wall fluxes allows reproduction of the global structure of the flow and
comparisons with experimental profiles agree reasonably well.
∗ PhD Student
† Professor. E-mail: nicoud@math.univ-montp2.fr
1 of 26