Laplace flow
Hi,
May I ask what is Laplace flow? Is it like an inviscid flow? What is a Laplace flow CFD? 
Steady incompressible, irrotational flow is governed by the Laplace equation.
Some references for reading up on this: Fundamentals of Aerodynamics by J. Anderson. https://en.wikipedia.org/wiki/Laplace_equation. 
The Laplace Operator is of particular interest for incompressible NavierStokes equations, as the diffusion term can be written in Laplace form. Also, the divergencefree constraint requires the solution of a Poisson equation. So for an incompressible flow solver (and viscosity dominated problems), the solution to the Laplace equation is central.
Thus, studying Laplace flow (and the associated solution strategies) is fundamental for incompressible solvers. 
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I've got a copy of the 3rd edition and it's on page 206.

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Chapter 3: Fundamentals of Inviscid, Incompressible Flow, Section 3.7 Governing Equation for Irrotational, Incompressible Flow: Laplace's Equation.

"Shall we say it is steadystate incompressible flow?"
No! As the name suggests, Laplace flow (or more commonly, potential flow) is governed (only) by the Laplace equation. Incompressible flow includes nonlinear convection, pressure gradient and viscosity terms (only du/dt=0 in the steady case, where d/dt is partial derivative). I strongly recommend that you open up any introductory book on fluid mechanics. Without understanding very basic fluid mechanics, your attempts at performing CFD will be futile  guaranteed! Adrin 
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