کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
519343 867657 2011 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pressure boundary conditions for computing incompressible flows with SPH
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Pressure boundary conditions for computing incompressible flows with SPH
چکیده انگلیسی

In Smoothed Particle Hydrodynamics (SPH) methods for fluid flow, incompressibility may be imposed by a projection method with an artificial homogeneous Neumann boundary condition for the pressure Poisson equation. This is often inconsistent with physical conditions at solid walls and inflow and outflow boundaries. For this reason open-boundary flows have rarely been computed using SPH. In this work, we demonstrate that the artificial pressure boundary condition produces a numerical boundary layer that compromises the solution near boundaries. We resolve this problem by utilizing a “rotational pressure-correction scheme” with a consistent pressure boundary condition that relates the normal pressure gradient to the local vorticity. We show that this scheme computes the pressure and velocity accurately near open boundaries and solid objects, and extends the scope of SPH simulation beyond the usual periodic boundary conditions.


► SPH method for computing incompressible flows using projection methods.
► Nonhomogeneous Neumann boundary condition for the pressure Poisson equation.
► The new boundary condition ensures consistency with the momentum equation.
► The scheme produces more accurate results, especially on pressure and drag.
► It facilitates simulation with open boundaries and flow around solid obstacles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 230, Issue 19, 10 August 2011, Pages 7473–7487
نویسندگان
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