ANA SAYFAYA DÖNMEK İÇİN TIKLAYINIZ

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/Thermal, 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"

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.  Conduction occurs between the sand mold and the ambient air.

Given

 

 

 

 

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.

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

1. Define keypoints.
2. Create areas for mold and casting.

Define Materials

3. Define material properties.
4. Plot material properties vs. temperature.

Generate Mesh

5. Set preferences.
6. Define element types.
7. Mesh the model.

Apply Loads

8. Apply convection loads on the exposed boundary lines.

Obtain Solution

9. Define analysis type.
10. Turn on solution control.
11. Specify initial conditions for the transient.
12. Set time, time step size, and related parameters.
13. Set output controls.
14. Solve.

Review Results

15. Enter the time-history postprocessor and define variables.
16. Plot temperature vs. time.
17. Set up to animate the results.
18. Animate the results.
19. Exit the ANSYS program.

 ANA SAYFAYA DÖNMEK İÇİN TIKLAYINIZ.