An exact pressure evolution equation for the incompressible Navier-Stokes equations

TL;DR

This paper derives an exact pressure evolution equation for incompressible Navier-Stokes fluids, enabling pressure advancement in simulations without solving the Poisson equation, thus improving computational efficiency.

Contribution

It introduces a novel exact pressure evolution equation based on an inverse kinetic approach, avoiding the need to solve the Poisson equation in CFD simulations.

Findings

Derived an exact pressure evolution equation for incompressible flows

The equation can be implemented in Lagrangian CFD codes

Potentially reduces computational cost in pressure calculation

Abstract

In this paper the issue of the determination of the fluid pressure in incompressible fluids is addressed, with particular reference to the search of algorithms which permit to advance in time the fluid pressure without actually solving numerically the Poisson equation. Based on an inverse kinetic approach recently proposed for the incompressible Navier-Stokes equations we intend to prove that an exact evolution equation can be obtained which advances in time self-consistently the fluid pressure. The new equation is susceptible of numerical implementation in Lagrangian CFD simulation codes.