Numerical heat transfer simulation

Module description:

valid for matrciulations after 2012

Lecturer: Prof. Dr.-Ing. Robert Pietzsch

Qualification aim:

• The students should be able to calculate independently temperature fields in simple technical structures

• They should know the terms and physical quantities of the theory of heat transfer and they should be able to apply them

• The thermal module of the ANSYS program to be safely used

• One important competence is to select the right finite element type for a given application and to understand the different properties and degree of shape function

• During the exam (120min) the students should demonstrate their skills to solve two heat transfer problems using ANSYS

Content:

• Laws and terms of heat transfer, balance equation of internal energy

• Manual calculation of temperature fields and simple heat transfer problems

• Fundamentals of the Finite Elements Method, elements formulation, shape functions, time integration methods, Introduction in ANSYS environment

• Simple cooling behaviour of a compact body

• Steady heat conduction in a linear rod

• Transient heat conduction in a cooled slab

• Thermal contact of two linear slabs at the face side (contact temperature)

• Transient heat exchange and temperature equalization in a plane structure

• Steady heat conduction and heat transfer capacity of a flat fin

• Thermomechanical coupling of structural and thermal calculation- thermal strains and stresses, thermal distortion

• Axissymmetric problems, solved in a cross section

• Heat conduction in volumetric bodies

• Radiation heat transfer as boundary condition

• Time-dependent thermal boundary conditions

Teaching methods: computer exercise with partial lecture character (4SWS)

Necessary knowledges:

• fundamentals of thermodynamics

• heat transfer

Usability: Renewable Resources Engineering (B.Eng.)

preparing exam: individually solved exercises

Grading practical examination at the computer (120min)

credits: 5 ECTS- Credits

frequency: annually in the winter semester

workload: 150 hours ( present time: 60h + self study 90h)

duration of one unit: 90 min

supporting documents: scriptum with solved and explained examples

Literature

• ANSYS theory manual

• Elements documentation