Courses

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1. Turbulent flows 2. Direct Numerical Simulations (DNS) 3. Reynolds Averaged Navier-Stokes equations (RANS) 4. Large Eddy Simulation (LES) 5. High-Order Methods 6. Particulate and Multiphase Flows 7. Fluid-structure Interaction 8. Compressible Flows
The students - Know how to solve CFD problems in curvilinear grids - Understand the main properties of turbulent flows - Understand the strengths and weaknesses of widely used simulation models of turbulence - Select the appropriate model and boundary equations for a given application - Be able to perform turbulence and complex flows simulations with OpenFOAM - Work in team and write a report describing the results and significance of a simulation of turbulent flow

Basic data

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The lecture provides an introduction to fluid mechanics. Basic definitions are provided and the most important laws are introduced.

The lecture covers continuum mechanical basics, flow kinematics, conservation laws, hydrostatics, basics of similarity, Bernoulli equation etc.

Flow is analyzed according to different types of motion. Continuity equation and Navier-Stokes equation are derived and their solutions are presented.

It is shown how flow-induced forces are calculated using the integral momentum equation to solve various engineering problems.

Based on the conservation laws, hydrostatics is treated as a special case in fluid mechanics and applied to various cases.

Order-of-magnitude arguments are used to consider other special cases of the Navier-Stokes equation like the Stokes and the Euler equation.

The Bernoulli equation is derived, its applicability is discussed and it is used to determine pressure distributions and answer other engineering related questions of fluid mechanics.

Exercises complete the lecture. Students are instructed to apply their knowledge to solve fluid mechanical problems. null

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- Grundsätze der technischen Lärmbekämpfung
- Größen, Grundbegriffe, Phänomene der technischen Akustik
- Grundlagen des Luftschalls
- Grundlagen des Körperschalls
- Geräuschentstehung in Maschinen und Anlagen
- Mechanische Geräuschquellen
- Strömungsakustik
- Strömungsakustische Multipole
- Strahl- und Rotorlärm
- Fluid-Struktur-Akustik Interaktion
- Numerische Berechnungsverfahren
- Grundprinzipien der Gestaltung lärmarmer Produkte und Anlagen

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Vorlesung 2 SWS

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Im Rahmen der Vorlesung werden praktisch einsetzbare Methoden zur Berechnung allgemeiner turbulenter Strömungen vorgestellt.

Ausgangspunkt sind die Navier-Stokes-Gleichungen, die formal hergeleitet und anschließend zeitgemittelt werden.

Die durch die Mittelung auftretenden Zusatzterme werden physikalisch interpretiert und gebräuchliche mathematische Modelle (Turbulenzmodelle) zur Beschreibung dieser Terme eingeführt.

Die Anwendung der vorgestellten Turbulenzmodelle auf für die Praxis relevante turbulente Strömungen, wie z.B. Grenzschichten, Freistrahlen etc. wird im Detail diskutiert.

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For CEP: 4 SWS

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The course gives an overview over the measuring techniques used in fluid dynamics, their basics, their possibilities and their limitations.

The students shall be enabled to choose for a given task an appropriate measuring technique. Topics covered:

Introduction into measuring techniques, flow visualisation, pressure measurements, pneumatic measuring techniques, volume flow measurements, force measurements, strain gauges,

thermal velocity measurements, hot wire anemometry, laser Doppler anemometry, phase Doppler anemometry,

particle image velocimetry, data acquisition, signal processing, statistics, time series analysis. null

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Bewertet wird zu einem speziellen Thema ein Vortrag und eine schriftliche Ausarbeitung

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The practical complements the lecture course in fluid mechanics in the 6th semester (Kernfach) and
provides experience in modern measuring techniques and various kinds of flows.

The practical is compulsory for chemical- and bio-engineering students with fluid mechanics I , and its contents are sometimes touched in examinations in fluid mechanics by Prof. Delgado.

The following experiments are carried out.

*Flow resistance in tubes:*
The influence of geometry, Reynolds number and surface roughness on the flow resistance of tubes and connecting elements

like pipe bends and valves is investigated experimentally. A closed-loop facility is used for this purpose.

Different methods for measuring flow rates through tubes, like magneto-inductive and standard-orifice methods, are used and compared.

*LDA-based flow rate measurements:*
The flow rate of water through a tube is measured using a modern measuring technique on the basis of laser-Doppler anemometry.

The basics of LDA are explained, and measurements are carried out and compared with the results from experiments with a bucket, scale and stopwatch.

One necessary prerequisite for applying the LDA technique is that the flow through the test section must be laminar. null

No planned appointments for this parallel group yet.

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1. Übung in der zweiten Vorlesungswoche

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