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Optimization of wall parameters using CFD
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aerodynamics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Computational Fluid Dynamics (CFD) is commonly used to calculate the pressure drop

in systems with internal ow. To get accurate results the physics of the ow must be well

dened together with the right material parameters of the considered geometry. The mate-

rial parameter considered in this report is the wall roughness, or sand-grain roughness, and

during the thesis work it has been investigated how dierent wall roughnesses aects the

pressure drop. It has also been investigated how to set up a CFD simulation to accurately

calculate the pressure drop. When setting up a simulation, a good mesh is essential to get

accurate results, while using a turbulence model and wall function that is correct for the

geometry and physics involved. Pressure drop measurements and the corresponding CAD

geometries were available at the start of the thesis work. The simulations were adapted to

these to nd the sand-grain roughness for the dierent materials. The main conclusions

is that the pressure drop can be accurately calculated when the sand-grain roughness is

known and the CFD simulation is well dened. It was found from the mesh sensitivity

study that it is essential that the rst cell size is at least twice the size of the sand-grain

roughness and that at least two cell layers are used to resolve the turbulent boundary layer.

Place, publisher, year, edition, pages
2014. , 14 p.
TRITA-AVE, ISSN 1651-7660 ; 2014:29
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-159875OAI: diva2:787495
Available from: 2015-02-10 Created: 2015-02-10 Last updated: 2015-02-10Bibliographically approved

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