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Reactive-Di usive Flow Inside Porous Medium
KTH, School of Engineering Sciences (SCI), Mechanics.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Understanding the reactive-di usive turbulent ow inside porous media is interesting

in many applications. It could have geochemical applications such as describing

the rock dissolution patterns in river beds or the e ect of riparian zones in nitrate

attenuation. Other applications could be, e.g. ow over and through vegetation,

porous heat exchangers such as metal foams, gas and oil industry, etc. A limited

number of studies have been carried out to understand the turbulent ow regime over

a porous medium. This might be due to the fact that Darcy's law cannot be applied

to turbulent ows. Therefore, the turbulent ow inside/above porous media needs to

be done with expensive numerical simulations. This cost is much higher if one wants

to solve the problem using Direct Numerical Simulation (DNS) in which the ow

eld is completely and directly computed from Navier-Stokes equations. This needs

much greater CPU power than other methods such as VANS(Volume-Averaged

Navier-Stokes) equations or LES(Large Eddy Simulations), etc; however, solving

the Navier-Stokes equation would eliminate any closure problems that appear in

turbulence models, which could be considered as an advantage. Furthermore, DNS

is able to detect the smallest length scales in turbulence structures which lead to

highly accurate results. In addition to Navier-Stokes equations, scalar transport

equation is also solved in order to model the transportation of reactive-di usive

solutes. In our case, the porous medium is modeled by a packed bed of spheres and

an Immersed Boundary Method (IBM) is used to apply the no-slip/no-penetration

conditions on the spheres. The main objective of this work is to study how a

reactive-di usive scalar is transported through porous media inspired by ows in

river beds where micro-organisms and vegetation consume nutrients inside the ow

besides the fact that porosity of the river beds a ect these activities as well as ow

behavior.

Place, publisher, year, edition, pages
2015. , 54 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-170776OAI: oai:DiVA.org:kth-170776DiVA: diva2:839832
Educational program
Master of Science - Turbomachinery Aeromechanic University Training
Supervisors
Examiners
Available from: 2015-07-06 Created: 2015-07-06 Last updated: 2015-07-06Bibliographically approved

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