A class of Cartesian grid embedded boundary algorithms for incompressible flow with time-varying complex geometries
We present a class of numerical algorithms for simulating viscous fluid problems of incompressible flow interacting with moving rigid structures. The proposed Cartesian grid embedded boundary algorithms employ a slightly different idea from the traditional direct-forcing immersed boundary methods: t...
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| Vydáno v: | Physica. D Ročník 240; číslo 20; s. 1583 - 1592 |
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| Médium: | Journal Article |
| Jazyk: | angličtina |
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Elsevier B.V
01.10.2011
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| ISSN: | 0167-2789, 1872-8022 |
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| Abstract | We present a class of numerical algorithms for simulating viscous fluid problems of incompressible flow interacting with moving rigid structures. The proposed Cartesian grid embedded boundary algorithms employ a slightly different idea from the traditional direct-forcing immersed boundary methods: the proposed algorithms calculate and apply the force density in the extended solid domain to uphold the solid velocity and hence the boundary condition at the rigid-body surface. The principle of the embedded boundary algorithm allows us to solve the fluid equations on a Cartesian grid with a set of external forces spread onto the grid points occupied by the rigid structure. The proposed algorithms use the MAC (marker and cell) algorithm to solve the incompressible Navier–Stokes equations. Unlike projection methods, the MAC scheme incorporates the gradient of the force density in solving the pressure Poisson equation, so that the dipole force, due to the jump of pressure across the solid–fluid interface, is directly balanced by the gradient of the force density. We validate the proposed algorithms via the classical benchmark problem of flow past a cylinder. Our numerical experiments show that numerical solutions of the velocity field obtained by using the proposed algorithms are smooth across the solid–fluid interface. Finally, we consider the problem of a cylinder moving between two parallel plane walls. Numerical solutions of this problem obtained by using the proposed algorithms are compared with the classical asymptotic solutions. We show that the two solutions are in good agreement.
► We propose a class of numerical algorithms for simulating solid–fluid interaction. ► The algorithms incorporate the gradient of the force density in the pressure equation. ► The algorithms improve the direct-forcing immersed boundary methods. ► The algorithms are robust for moving structures with complex geometries. |
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| AbstractList | We present a class of numerical algorithms for simulating viscous fluid problems of incompressible flow interacting with moving rigid structures. The proposed Cartesian grid embedded boundary algorithms employ a slightly different idea from the traditional direct-forcing immersed boundary methods: the proposed algorithms calculate and apply the force density in the extended solid domain to uphold the solid velocity and hence the boundary condition at the rigid-body surface. The principle of the embedded boundary algorithm allows us to solve the fluid equations on a Cartesian grid with a set of external forces spread onto the grid points occupied by the rigid structure. The proposed algorithms use the MAC (marker and cell) algorithm to solve the incompressible Navier–Stokes equations. Unlike projection methods, the MAC scheme incorporates the gradient of the force density in solving the pressure Poisson equation, so that the dipole force, due to the jump of pressure across the solid–fluid interface, is directly balanced by the gradient of the force density. We validate the proposed algorithms via the classical benchmark problem of flow past a cylinder. Our numerical experiments show that numerical solutions of the velocity field obtained by using the proposed algorithms are smooth across the solid–fluid interface. Finally, we consider the problem of a cylinder moving between two parallel plane walls. Numerical solutions of this problem obtained by using the proposed algorithms are compared with the classical asymptotic solutions. We show that the two solutions are in good agreement.
► We propose a class of numerical algorithms for simulating solid–fluid interaction. ► The algorithms incorporate the gradient of the force density in the pressure equation. ► The algorithms improve the direct-forcing immersed boundary methods. ► The algorithms are robust for moving structures with complex geometries. |
| Author | Lee, Long Vankova, Irena |
| Author_xml | – sequence: 1 givenname: Long surname: Lee fullname: Lee, Long email: llee@uwyo.edu – sequence: 2 givenname: Irena surname: Vankova fullname: Vankova, Irena |
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| Keywords | MAC scheme Moving rigid structures Incompressible Navier–Stokes equations Cartesian grid Immersed boundary method Direct forcing |
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| SubjectTerms | Cartesian grid Direct forcing Immersed boundary method Incompressible Navier–Stokes equations MAC scheme Moving rigid structures |
| Title | A class of Cartesian grid embedded boundary algorithms for incompressible flow with time-varying complex geometries |
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