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Importance & Requirement of CFD Analysis
Generally CFD analysis is carried out where there is a flow of water or any stream involving sumps, pumps, pipe/channels etc. The fluid flow
in sumps is rather complex involving expansions, turns together with fluid
structure interaction. It is essential to ensure that pumps operating in such
sumps get smooth swirl free flow at its entry. Traditional approach was to
carry out sump model studies experimentally with a reduced scale model and
applying Froude Similarity rules.
Computational Fluid Dynamics (CFD) has
recently come up as an alternative approach to investigate the complex fluid
flow phenomenon in sumps. It is a software based application to study various fluid dynamics. It is rapidly becoming an important tool for analysis
and design in hydraulic engineering. Hydraulic engineering encompasses a broad
range of activity from flow in a river to design of structures to control and
distribute/divert water for various purposes. These flow problems have features
that are not commonly found in other applications.
In the case of pump industry
applications, CFD tools are important in view of analysis of the hydraulic
passage of the pumps and sumps. For impeller inlet, CFD can help to improve the
inlet flow distribution by proper designing/ checking the quality of flow in
pump sump. In case of sumps, CFD analysis is used to investigate flow quality
entering into the pump at various combinations of pumps in operation. The
analysis is done at minimum water level with pumps running at duty point. If
the performance of sump is satisfactory at minimum water level, then the
performance of the sump will be satisfactory at all other higher water levels
because of reduction in velocities.