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Characterization of Flow Field in a Multi-Occupant Environment

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  014068,  2001 ASAE Annual Meeting. (doi: 10.13031/2013.6273) @2001
Authors:   B. X .Wu, K.G. Gebremedhin
Keywords:   Flow field, CFD, Ventilated space, Three-dimensional, Multi-cow environment.

Characterization of flow field in a multi-occupant (cows) ventilated space was conducted using a computational fluid dynamics (CFD) technique. Airflow in a ventilated space is affected by the locations of the inlet and outlet and shape and location of the cows. The mathematical model that describes airflow in a multi-cow environment involves continuity and momentum equations as well as a turbulence model. The actual cows’ configurations are treated as boundary conditions. The boundary conditions consist of: (1) four cows standing in a row with an inlet placed at one end of the wall and the outlet at the opposite end, (2) four cows standing in a row with two inlets placed at opposite ends and an outlet at the center of the ceiling, and (3) ten cows placed at random with inlets and an outlet as in Case (2). The body-fitted coordinate (BFC) system is adopted to characterize the shape of the cows, and the governing equations in Cartesian coordinate system are transformed into the BFC system. To generate the BFC system, partial differential equations and algebraic interpolation methods were used. The finite volume method is applied to transform the partial differential equations into algebraic ones, and the SIMPLE (Semi-Implicit Method for Pressure-Linked Equation) algorithm is extended to the BFC system to solve the flow field. The calculated results are expressed in velocity vectors, streamline plots, and velocity component profiles.

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