Numerical Simulation of Three-Dimensional and Bi-Disperse Particle-Laden Turbidity Current in an Experimental Channel in the Presence of an Obstacle

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, University Of Zanjan, Zanjan, Iran.

2 Mechanical engineering department, University of Zanjan

Abstract

In the present study, the propagation of a continuous three-dimensional, in collision with obstacle and bi-disperse particle-laden turbidity current with a large eddy simulation method was modeled using the OpenFOAM numerically. Due to the presence of a large number of suspended particles, the Eulerian-Eulerian method has been used and for each particle a concentration equation, which the particles settling velocity has been added to, is solved. The results show that before the obstacle, there is no significant change in the current velocity profiles in with and without obstacle state, but the presence of an obstacle decreases the maximum velocity by 10%, also the number of suspended particles on the obstacle decreases in channel width. In the final semi-stable state, the maximum concentration of 15.3% is reduced compared to the without obstacle state. By increasing the particle diameter to 20 and 30 microns, maximum concentration is increased by 12.5% and 22.3%, the number of suspended particles also decreases by 68% and 21%, respectively. As a result, particles with larger diameter precipitate more and rapidly. Changing the inlet concentration in the case of smaller diameter particle increases the number of suspended particles by 11.2% and current will have more capability for carrying suspended particles.

Keywords

Main Subjects

References

[1]  J. Zordan, C. Juez, A. J. Schleiss, and M. J. Franca, Entrainment, transport and deposition of sediment by saline gravity currents, Advances in Water Resources 115 (2018) 17-32.
[2] L. Ottolenghi, C. Adduce, R. Inghilesi, V. Armenio, and F. Roman, Entrainment and mixing in unsteady gravity currents, J. Hydraul. Res  54 (5) (2016) 541– 557.
[3] J. Pelmard, S. Norris, and H. Friedrich, LES grid resolution requirements for the modelling of gravity currents, Computers & Fluids 174 (30 September) (2018) 256-270.
[4] M. Mahdinia, B. Firoozabadi, M. Farshchi, A.G.Varnamkhasti, Large Eddy Simulation of LockExchange Flow in a Curved Channel, J. Hydraul. Eng  138 (1) (2011) 57–70.
[5]  L. Ottolenghi, C. Adduce, R. Inghilesi, F. Roman, and V. Armenio, Mixing in lock-release gravity currents propagating up a slope, Phys. Fluids 28(5) (2016).
[6] G. Gonzalez-Juez, E., Meiburg, E., and Constantinescu, Gravity currents impinging on bottom-mounted square cylinders: Flow fields and associated forces, J. Fluid Mech  631(2009) 65–102.
[7]  M. Nasr-Azadani and E. Meiburg, Influence of seafloor topography on the depositional behavior of bi-disperse turbidity currents: a three-dimensional , depth-resolved numerical investigation, Environ. Fluid Mech 14 (2) (2014) 319–342.
[8]  M. M. Nasr-Azadani and E. Meiburg, Turbidity currents interacting with three-dimensional seafloor topography, J. Fluid Mech  745 (2014) 409–443.
[9]  M. M. Nasr-Azadani, B. Hall, and E. Meiburg, Polydisperse turbidity currents propagating over complex topography: Comparison of experimental and depth-resolved simulation results, Comput. Geosci 53 (2013) 141–153.
[10] M. M. Nasr-azadani, E. Meiburg, and B. Kneller, Mixing dynamics of turbidity currents interacting with complex seafloor topography, Environ. Fluid Mech 18 (1) (2016) 201-223.
[11] N. Najafpour, 3D modeling of continuous dense current using large eddy simulation method, Master’s Thesis, Department of Mechanical Engineering, Sharif University of Technology, Tehran, 2012. (in Persian)
[12] S. Abbaszadeh, Large Eddy Simulation of Continuous Density Current impinging on Obstacles, PhD Thesis, Department of Mechanical Engineering, Sharif University of Technology, Tehran 2014. (in Persian)
[13] J. H. Francisco, E.P., Espath, L.F.R., and Silvestrini, Direct numerical simulation of bi-disperse particleladen gravity currents in the channel configuration, Appl. Math. Model 49 (2017) 739–752.
[14] M. H. Garcia, Hydraulic jumps in sedimentdriven bottom currents, J. Hydraul. Eng 119 (1993)(10) 1094–1117.
[15] C. D. Pierce, Progress-variable approach for largeeddy simulation of turbulent combustion, in Rep. TF-80, Mech. Eng. Department, Rep. TF-80, Mech. Eng. Dep. Stanford Univercity 2001.
[16] S. K. Ooi, G. Constantinescu, and L. Weber, Numerical simulations of lock-exchange compositional gravity current, J. Fluid Mech  635 (2009) 361–388.
[17] J. Kim, and P. Moin, Numerical investigation of turbulent channel flow, J. Fluid Mech 118 (1982) 341–377.
[18] E Khavasi, M. Oshaghi, S. M. A. Mousavi, V. Zarei, M. Ghenaatpishe, B. Firoozabadi, and H. Afshin Experimental investigation of the effect of obstacle on turbidity currents, in Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran 2012.
[19] D. K. Lilly, A proposed modification of the Germano subgrid-scale closure method, Phys. Fluids A Fluid Dyn 4 (3) (1992) 633–635.
[20] C. Härtel, E. Meiburg, and F. Necker, Analysis and direct numerical simulation of the flow at a gravitycurrent head. Part 1. Flow topology and front speed for slip and no-slip boundaries, J. Fluid Mech 418 (2000) 189–212.
[21] C. Härtel,  F. Carlsson, and M. Thunblom, Analysis and direct numerical simulation of the flow at a gravity-current head. Part 2. The lobe-and-cleft instability, J. Fluid Mech  418 (1) (2000) 213–229.
[22] S. Venayagamoorthy, S. J. Koseff, J. Ferziger, and L. Shih, Testing of RANS turbulence models for stratified flows based on DNS data., DTIC Doc  (2003) 127-138.
[23] B. P. Leonard, A stable and accurate convective modelling procedure based on quadratic upstream interpolation, Comput. Methods Appl. Mech. Eng 19 (1) (1979) 59–98.
[24] A. Peer, A., M. Dauhoo, and M. Bhuruth, A new fourth-order nonoscillatory central scheme for hyperbolic conservation laws, Appl. Numer. Math  .886–476 )8002( )5( 85
[25] M. Garcia and G. Parker, Experiments on the Entrainment of Sediment into Suspension by a Dense Bottom Current, J. Geophys. Res 98 (3) (1993) 4793–4807.
[26] M. H. Garcia, Depositional turbidity currents laden with poorly sorted sediment, J. Hydraul. Eng 120 (11) (1994) 1240–1263.
[27] E. Khavasi, Experimental study of sediment behavior of the particle laden density current, Master’s Thesis, Department of Mechanical Engineering, Sharif University of Technology, Tehran 2009. (in Persian)
[28] M. S. Altinakar, W. H. Graft, and E.J. Hopfinger, Flow Structure in Turbidity Current, J. Hydr. Res 34 (5) (1996) 713-718.
Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 7
October 2020
Pages 1955-1974

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