CFD Analysis of Natural Convection in Enclosed Cavity using a Fuzzy Logic Guidance Method

A. Jain and D.A. Kaminski (USA)


Fuzzy logic, computational fluid dynamics, rectangular enclosure, relaxation factor


Fuzzy logic is used as a guiding mechanism for fast convergence in computational fluid analysis. Membership functions are adjusted using a pre-defined set of fuzzy rules which guide the iterative scheme towards convergence. The model problem of natural convection in a rectangular enclosed cavity is analyzed using this scheme. To test the efficacy of the fuzzy logic guidance method, conjugate heat transfer is imposed on the rectangular cavity with conduction through the thick walls on one and both sides of the cavity. Two of the boundaries are held at constant temperature and the other two at constant heat flux. Governing equations of continuity, momentum and energy in laminar flow are solved using a finite difference method. The problem is tested for different values of relaxation factors and compared with the controller algorithm. The enclosed cavity is also subjected to a change in the inclination angle and the number of iterations is evaluated.

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