34 transient_ex2_-_gui[1]

34 transient_ex2_-_gui[1] - Solidification of a Casting...

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Solidification of a Casting Problem Specification Problem Description Build Geometry Steps Define Material Steps Generate Mesh Steps Apply Loads Steps Obtain Solution Steps Review Results Steps Problem Specification Applicable ANSYS Products: ANSYS/Multiphysics, ANSYS/Mechanical, ANSYS/ED Level of Difficulty: moderate Interactive Time Required: 60 to 90 minutes Discipline: thermal Analysis Type: nonlinear transient Element Types Used: PLANE77 ANSYS Features Demonstrated: solid modeling, conduction, convection, phase change, selecting, solution control, time-history postprocessing, use of a "get function" Applicable Help Available: (NOTE: The contents of the particular help topic that you choose will appear in this browser window, replacing the information you are now reading. When you are finished reading the help topic, click on the browser's Back button to return to this tutorial.) Thermal Analysis Guide - Chapter 3. Transient Thermal Analysis , Elements Reference - PLANE77 Problem Description This is a transient heat transfer analysis of a casting process. The objective is to track the temperature distribution in the steel casting and the mold during the solidification process, which occurs over a duration of 3 hours. The casting is made in an L-shaped sand mold with 4 inch thick walls. Convection occurs between the sand mold and the ambient air. Given Material Properties for Sand Conductivity (KXX) 0.025 Btu/(hr- in- o F) Density (DENS) 0.054 lb/in 3 Specific heat (C) 0.28 Btu/(lb- o F)

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Approach and Assumptions A 2-D analysis of a one unit thick slice will be performed. Half symmetry is used to reduce the size of the model. The lower half is the portion modeled. The mold material (sand) has constant material properties. The casting (steel) has temperature- dependent thermal conductivity and enthalpy; both are input in a table of values versus temperature. The enthalpy property table captures the latent heat capacity of the metal as it solidifies. Radiation effects are ignored. Solution control is used to establish several nonlinear options, including automatic time stepping. Automatic time stepping determines the proper time step increments needed to converge the phase change nonlinearity. This means that smaller time step sizes will be used during the transition from molten metal to solid state. Conductivity (KXX) for Steel at 0 o F 1.44 Btu/(hr-in- o F) at 2643 o F 1.54 at 2750 o F 1.22 at 2875 o F 1.22 Enthalpy (ENTH) for Steel at 0 o F 0.0 Btu/in 3 at 2643 o F 128.1 at 2750 o F 163.8 at 2875 o F 174.2 Initial Conditions Temperature of steel 2875 o F Temperature of sand 80 o F Convection Properties Film coefficient 0.014 Btu/(hr- in 2 - o F) Ambient temperature 80 o F
Summary of Steps Use the information in the problem description and the steps below as a guideline in solving the problem on your own. Or, use the detailed interactive step-by-step solution by choosing the link for step 1. Build Geometry

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This note was uploaded on 01/20/2010 for the course ME master taught by Professor Mon during the Spring '09 term at Hanyang University.

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34 transient_ex2_-_gui[1] - Solidification of a Casting...

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