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A comparison of interpolation methods in fast fluid dynamics.

Number: 3199

Author(s) : LEONARD E., QIAO H., NABI S.

Summary

The efficient use of air conditioners in buildings is an important, ongoing area of research. In order to develop accurate models of the performance of an air conditioner, it is necessary to incorporate information about the room that the air conditioner cools. The accuracy of a coupled simulation which models an air conditioner as well as the dynamics of the air flow in a room induced by the air conditioner can be enhanced through the use of computational fluid dynamics (CFD). By using a CFD simulation to generate detailed information about the dynamical and thermal patterns of air flow in a room generated by an air conditioner, researchers can, for instance, determine locations for the air conditioner which will lead to more efficient performance. Although there are great benefits to using CFD in a coupled simulation which models the performance of an air conditioner and the room that it cools, CFD simulations can be slow as described in Qiao et al. (2019). Concerns around the speed of CFD have facilitated an interest in an alternative algorithm to traditional computational fluid dynamics called fast fluid dynamics (FFD) in which the solutions to the Navier-Stokes equations are approximated through the use of a time-splitting method which generates separate equations for the dynamics related to advection, diffusion, and pressure gradients as described in Zuo (2010). The authors of this paper have implemented a version of FFD using the open-source software toolbox OpenFOAM which is in line with the work of Liu et al. (2016). One particularly interesting aspect of FFD is that the advection equation that it generates necessitates the use of an interpolation routine to determine intermediate velocities at points not located at the cell centers of meshes designed to cover the domain of interest. Following this line of inquiry, the current paper compares and contrasts the use of two of OpenFOAM’s interpolation routines - cellPoint and cellPointWallModified - in the FFD algorithm. In addition, this paper presents a novel use of OpenFOAM’s data structures which speeds up FFD and discusses the incorporation of the Boussinesq approximation into FFD.

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Pages: 10

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Details

  • Original title: A comparison of interpolation methods in fast fluid dynamics.
  • Record ID : 30028634
  • Languages: English
  • Subject: Technology
  • Source: 2021 Purdue Conferences. 6th International High Performance Buildings Conference at Purdue.
  • Publication date: 2021/05/24
  • Document available for consultation in the library of the IIR headquarters only.

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