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Tutorial: UDFs for a User-Defined Scalar
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Tutorial: UDFs for a User-Defined Scalar Introduction ANSYS FLUENT solves the the transport equation for a user-defined scalar (UDS) in the same way as it solves the transport equation for a scalar ... in the core equations, such as a species mass fraction. The UDS capability can be used to implement a wide range of physical models in magnetohydrodynamics, electromagnetics, and more. In this tutorial you will learn to solve a general scalar diffusion equation (1) with the possible types of boundary condition (BC) at the boundary (or a part of the boundary) of the domain. c @φ @t − r: (Γrφ) = Sφ; in Ω; t > 0 (1) The possible types of boundary conditions are as follows: • Dirichlet BC: φ = D0 • Neumann BC: −Γ(@φ=@n) = q0 • Mixed BC: −Γ(@φ=@n) = hc(φ − φ1) Here, D0, q0, hc, and φ1 are constant values. Prerequisites This tutorial is written with the assumption that you have completed Tutorial 1 from ANSYS FLUENT 12.0 Tutorial Guide, and that you are familiar with the ANSYS FLUENT navigation pane and menu structure. Some steps in the setup and solution procedure will not be shown explicitly. For more details about UDFs, see ANSYS FLUENT 12.0 UDF Manual. Problem Description As shown in the problem illustration, the problem is a 2D rectangle, with constant flux, constant value, and mixed boundary conditions along the boundary edges. [Show More]
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