Pressure-enthalpy Coupling For Subsonic Flows
With Density Variation
Author(s)
M. Emans, S. Frolov, B. Lidskii, V. Posvyanskii,
Z. Žunič & B. Basara
Abstract
The method we present is derived from the SIMPLE algorithm. Instead of
solving the linear equations for each variable and the pressure-correction equation
separately in a so called segregated manner it relies on the solution of a linear
system that comprises the discretisation of enthalpy and pressure-correction
equation that are linked through physical coupling terms. These coupling terms
are deduced from a more accurate approximation of the density update (compared
to standard SIMPLE method) that is reasonable with respect to the thermodynamic
formulation of the density increment. The method leads to a considerable
acceleration of the non-linear SIMPLE convergence not only in cases characterised
by a global density change due to the rise of the pressure, but also if the enthalpy
is merely spatially distributed in the computational domain. In this contribution
we will first discuss the key idea of the new method and compare it to established
techniques. Then we will demonstrate its advantages in terms of computational
efficiency and robustness for industrial CFD applications, e.g. combustion and
engine flow calculations on unstructured grids.
Keywords: finite volumes, pressure-enthalpy coupling, variable-density flow,
CFD.
1 Introduction
Robust methods that provide an appropriate approximation of the solution of the
Navier–Stokes equations for CFD (computational fluid dynamics) applications
employ finite volumes for the spatial discretisation and master the non-linearity of
Keywords
finite volumes, pressure-enthalpy coupling, variable-density flow,
CFD
Related Book
Other papers in this volume
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