Controlling density fluctuations in wall-bounded dissipative particle dynamics systems |
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Authors: | Pivkin Igor V Karniadakis George Em |
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Institution: | Division of Applied Mathematics, Brown University, Providence, Rhode Island 02912, USA. piv@dam.brown.edu |
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Abstract: | Dissipative Particle Dynamics (DPD) simulations of wall-bounded flows exhibit density fluctuations that depend strongly on the no-slip boundary condition and increase with the level of coarse graining. We develop an adaptive model for wall-particle interactions that eliminates such oscillations and can target prescribed density profiles. Comparisons are made with ideal no-slip boundary conditions and molecular dynamics simulations. The new model is general and can be used in other coarse-grained particle methods. |
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