We study drag reduction of a uniform flow over a flat surface due to a series of rectangular microgrooves created on the surface. The results reveal that making grooves on the surface usually leads to the generation of secondary vortices inside the grooves that, in turn, decreases the friction drag force and increases the pressure drag force. By increasing the thickness of the grooves to the thickness of the obstacle, the pressure drag increases due to the enhancement of the generated vortices and the occurrence of separation phenomenon and the friction drag reduces due to a decrease of the velocity gradient on the surface. In addition, by increasing the grooves depth ratio, the pressure drag coefficient decreases and the friction drag coefficient increases. However, the impact of the pressure drag coefficient is higher than that of the friction drag coefficient. From a specific point, increasing the groove depth ratio does not effect on decreasing the total pressure drag of the plate. Therefore, creating the grooves in flat surfaces would reduce the total drag coefficient of the plate if the thickness of the grooves does not exceed a specific size and the depth of the grooves is chosen to be sufficiently large. The lattice-Boltzmann method (LBM) is used and the optimal reduction of the drag coefficient is calculated. It is found that for the width ratio equal to 0.19 and the groove depth ratio equal to 0.2548, about 7% decrease is achieved for the average total drag.
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July 2019
Research-Article
Numerical Simulation of Drag Reduction in Microgrooved Substrates Using Lattice-Boltzmann Method
H. Asadzadeh,
H. Asadzadeh
Center of Excellence in Energy Conversion
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: homayoun.sut@gmail.com
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: homayoun.sut@gmail.com
Search for other works by this author on:
A. Moosavi,
A. Moosavi
Center of Excellence in Energy Conversion
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567
Tehran 11365-9567, Iran
e-mail: Moosavi@sharif.edu
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567
Tehran 11365-9567, Iran
e-mail: Moosavi@sharif.edu
1Corresponding author.
Search for other works by this author on:
A. Etemadi
A. Etemadi
Center of Excellence in Energy Conversion
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: armin.e90@gmail.com
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: armin.e90@gmail.com
Search for other works by this author on:
H. Asadzadeh
Center of Excellence in Energy Conversion
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: homayoun.sut@gmail.com
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: homayoun.sut@gmail.com
A. Moosavi
Center of Excellence in Energy Conversion
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567
Tehran 11365-9567, Iran
e-mail: Moosavi@sharif.edu
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567
Tehran 11365-9567, Iran
e-mail: Moosavi@sharif.edu
A. Etemadi
Center of Excellence in Energy Conversion
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: armin.e90@gmail.com
(CEEC),
School of Mechanical Engineering,
Sharif University of Technology,
Azadi Avenue,
P.O. Box 11365-9567,
Tehran 11365-9567, Iran
e-mail: armin.e90@gmail.com
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 28, 2018; final manuscript received February 8, 2019; published online April 4, 2019. Assoc. Editor: Moran Wang.
J. Fluids Eng. Jul 2019, 141(7): 071111 (18 pages)
Published Online: April 4, 2019
Article history
Received:
September 28, 2018
Revised:
February 8, 2019
Citation
Asadzadeh, H., Moosavi, A., and Etemadi, A. (April 4, 2019). "Numerical Simulation of Drag Reduction in Microgrooved Substrates Using Lattice-Boltzmann Method." ASME. J. Fluids Eng. July 2019; 141(7): 071111. https://doi.org/10.1115/1.4042888
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