Intro1_M12_thermal

Intro1_M12_thermal - Thermal Analysis Chapter 12 February...

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Unformatted text preview: Thermal Analysis Chapter 12 February 7, 2006 Inventory #002268 12-2 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS -Part 1 Part 1 Part 1 Training Manual • In this chapter, we will describe the specifics of a thermal analysis. • The purpose is two-fold: – To reiterate the general analysis procedure. – To introduce you to thermal loads and boundary conditions Chapter 12 – Thermal Analysis Overview February 7, 2006 Inventory #002268 12-3 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS -Part 1 Part 1 Part 1 Training Manual Geometry • Can either be created within ANSYS or imported . • Include details to improve results: – Goal is to sufficiently model the thermal mass of the structure. – Convection loads requires areas be correctly modeled. – Heat generation loads requires the volumes be correctly modeled. Chapter 12 – A. Preprocessing Geometry February 7, 2006 Inventory #002268 12-4 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS -Part 1 Part 1 Part 1 Training Manual • Element type • The table below shows commonly used thermal element types. • The nodal DOF is: TEMP. Commonly used thermal element types Chapter 12 – A. Preprocessing Meshing • Material properties – Minimum requirement is Kx, thermal conductivity for steady state analysis. – Setting preferences to “thermal” limits the Material Model GUI to display only Thermal properties. • Real constants / Section properties – Primarily needed for shell and line elements. 2-D Solid 3-D Solid 3-D Shell Line Elements Linear PLANE55 SOLID70 SHELL57 LINK31, 32, 33, 34 SHELL131 Quadratic PLANE77 SOLID90 SHELL132 PLANE35 SOLID87 February 7, 2006 Inventory #002268 12-5 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS -Part 1 Part 1 Part 1 Training Manual • Thermal loading conditions can be: Temperatures Regions of the model where temperatures are known. Heat flow Points where the heat flow rate is known. Heat flux Surfaces where the heat flow rate per unit area is known. Convections Surfaces where heat is transferred to (or from) surroundings by means of convection. Input consists of film coefficient h and bulk temperature of the surrounding fluid T b . Heat generation Regions where the volumetric heat generation rate is known. Adiabatic surfaces “Perfectly insulated” surfaces where no heat transfer takes place. Radiation* Surfaces where heat transfer occurs by means of radiation. Input consists of emissivity, Stefan-Boltzmann constant, and optionally, temperature at a “space node.” * Not covered in this course Chapter 12 – B. Solution Overview February 7, 2006 Inventory #002268 12-6 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS -Part 1 Part 1 Part 1 Training Manual Chapter 12 – B. SolutionChapter 12 – B....
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This note was uploaded on 12/10/2009 for the course ME master taught by Professor Mon during the Spring '09 term at Hanyang University.

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Intro1_M12_thermal - Thermal Analysis Chapter 12 February...

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