Journal article

Direct numerical simulation of pattern formation in subaqueous sediment

Aman G Kidanemariam, M Uhlmann

JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2014

Abstract

We present results of direct numerical simulation of incompressible fluid flow over a thick bed of mobile spherically shaped particles. The algorithm is based upon the immersed-boundary technique for fluid-solid coupling and uses a soft-sphere model for the solid-solid contact. Two parameter points in the laminar flow regime are chosen, leading to the emergence of sediment patterns classified as 'small dunes', while one case under turbulent flow conditions leads to 'vortex dunes' with significant flow separation on the lee side. The wavelength, amplitude and propagation speed of the patterns extracted from the spanwise-averaged fluid-bed interface are found to be consistent with available ex..

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University of Melbourne Researchers

Grants

Awarded by German Research Foundation (DFG)


Funding Acknowledgements

This work was supported by the German Research Foundation (DFG) through grant UH 242/2-1. The computer resources, technical expertise and assistance provided by the staff at LRZ Munchen (grant pr58do) are gratefully acknowledged.