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Modeling of Turbulent flow (k-epsilon) with a down scaled 3D model
Posted 7 mag 2014, 10:38 GMT-4 Computational Fluid Dynamics (CFD) Version 4.3b 0 Replies
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This is a scaling issue (real world to model). I have made a simplified 3D model of a ventilation shaft (fan + damper + chamber + shaft). However due to computation time I have scaled all dimensions down to 1/100 of real size. The aim is to do some changes in the 3D model and find how this affects the total pressure drop (among others). However the inlet air flow velocity (m/s) is not scaled (since this will be taken care of by multiplying with the scale factor to get the real volume flow.
My intuition tells me that keeping the real velocity and down scaling the dimensions results in a "wrong/different" flow regime and Reynolds number (-> Prantl number) than what I am trying to model. Hence not representing my real situation and giving me wrong pressure drops.
Can someone guide me to a solution to this scaling problem, it must be a common way of scaling down real situations into manageable computational models and calculations?
Sincerely Morten
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Hello Morten Huse
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