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Three-dimensional numerical modeling of water flow in a rock-blasted tunnel

Vold, Mari
Master thesis
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URI
http://hdl.handle.net/11250/2459765
Date
2017
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  • Institutt for bygg- og miljøteknikk [5107]
Abstract
Climate change leads to more intense precipitation in Norway. NVE requires all bypass tunnels have sufficient capacity for bypassing flood water. The hydro-power industry needs a method for establishing tunnel capacity, such as computing a friction factor. Friction factor for rock-blasted tunnels have yet to be studied thoroughly. This thesis describes a method for finding friction factors for Litjfosstunnellen using numerical models. Three turbulence models are tested and compared; k-Epsilon, k-Omega and k-Omega SST. For otherwise identical setups k-Epsilon converges better than the other two. k-Epsilon yields larger Darcy friction factors than k-Omega and k-Omega SST in general. Grids with more cells yield larger friction factors than a coarse mesh (with one exception). Grid independence is not reached.
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NTNU

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