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LES Simulation of Hot-wire Anemometers
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
2017 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Hot wire anemometers have been used in several wind velocity sensors deployed in Mars. They are based in keeping the temperature of a surface at a constant value, above the ambient. This is done by means of a heater controlled with an electronic system.

The cooling rate of each point at the sensor surface can be used to calculate the wind velocity and direction. However, due to turbulent fluctuations, the cooling rate is not constant even in the case of constant velocity. Moreover, RANS simulations cannot estimate such fluctuations as they only provide an estimation of the averaged flow field.

The goal of this work has been to estimate such fluctuations and the e↵ect they might have on the sensor readings. To do so, the turbulent cooling rate (Nusselt number) of a sensor with a generic shape, under the typical conditions to be find in Mars, has been simulated using high performance LES (Large Eddy Simulation) simulations and compared with RANS and URANS simulations. 

Place, publisher, year, edition, pages
2017. , p. 109
Keywords [en]
Hot-wire anemometer, Hot-film anemometer, Computational Fluid Dynamics, Mars Science Laboratory, MSL, Mars, Large Eddy Simulations, LES, Reynolds-Averaged Navier–Stokes equations, RANS
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-62264OAI: oai:DiVA.org:ltu-62264DiVA, id: diva2:1078130
Educational program
Space Engineering, master's level
Supervisors
Available from: 2017-03-09 Created: 2017-03-02 Last updated: 2017-03-13Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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Language
  • de-DE
  • en-GB
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  • Other locale
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Output format
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