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Geometry Mediated Drag Reduction Using Riblets and Textures
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Laminar Taylor Couette Flow :
Experimental and numerical investigation in the optimum riblet geometry for drag reduction;
Experiments conducted with 3D printed rotors with Form 1+ 3D printer and AR-G2 rheometer (measuring rotation rates and torque)
Numerical calculations with open source CFD software OpenFOAM
Using C++ scripts to generate mesh files for the blockMesh utility in OpenFOAM
Additional OpenFOAM utilities coded for post-processing results from Taylor Couette modeling and calculations
- Conference presentations:
- Raayai, S., McKinley, G. –Frictional Torque Reduction in Taylor-Couette Flows with Riblet-Textured Rotors. Presented at the American Physical Society, 70th Annual Division of Fluid Dynamics Meeting, November 2017, Denver, CO
- Raayai, S., McKinley, G. – Reduction in Frictional Torque in Taylor-Couette Flows with Riblet-Textured Rotors. Presented at the 54th Annual Society of Engineering Science (SES) Meeting, July 2017, Boston, MA
- Raayai, S., McKinley, G. – Geometry Mediated Drag Reduction in Taylor-Couette Flows. Presented at the American Physical Society, 68th Annual Division of Fluid Dynamics Meeting, November 2015, Boston, MA
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Laminar Boundary Layer :
Numerical investigation of boundary layer growth over riblet surfaces
Numerical calculations with open source CFD software OpenFOAM
Analysis using the idea of boundary layer thickness and shape of the velocity profile along the flow direction
Investigating the viscous effects and the flow retardation inside the grooves
- Journal Articles
- Conference presentations:
- Raayai, S., McKinley, G. – Optimizing Geometry Mediated Skin Friction Drag on Riblet-Textured Surfaces. Presented at the American Physical Society, 69th Annual Division of Fluid Dynamics Meeting, November 2016, Portland, OR
- Raayai, S., McKinley, G., Boyce, M. – Mechanics of Flow over Wrinkles Surfaces. Presented at the American Physical Society, 67th Annual Division of Fluid Dynamics Meeting, November 2014, San Francisco, CA
- Raayai, S., McKinley, G., Boyce, M. – Mechanics of Fluid Flow over Compliant Wrinkled Polymeric Surfaces. Presented at the United States National Congress on Theoretical and Applied Mechanics, June 2014, East Lansing, MI
- Raayai, S., McKinley, G., Boyce, M. – Mechanics of Fluid Flow Over Compliant Wrinkled Polymeric Surfaces. Presented at the American Physical Society Meeting, March 2014, Denver, CO
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Geometric modification of wrinkling
- Graded Wrinkling: Numerical Modeling of wrinkling phenomenon with altered geometries
Inducing non-uniform stresses, resulting in non-uniform wrinkled surfaces
Creating gradients in amplitudes and wavelengths of the sinusoidal wrinkles
Theoretical analysis of graded wrinkling with simple trapezoidal geometry to predict the critical load
Thin Films with Micro-Topologies Prepared by Sequential Wrinkling. U.S. Patent Application 13/795,209.
- Journal Articles:
- Raayai-Ardakani S, Luis Yagüe J, Gleason KK, Boyce MC. Mechanics of Graded Wrinkling. ASME. J. Appl. Mech. 2016;83(12):121011-121011-10. doi:10.1115/1.4034829.
- Conference presentations:
- Raayai, S., Boyce, M. – Mechanics of Graded Wrinkling. Presented at the 50th Annual Society of Engineering Science (SES) Meeting, July 2013, Providence, RI
- Raayai, S., Boyce, M. – Mechanics of Graded Wrinkling. Presented at the American Physical Society Meeting (APS), March 2013, Baltimore, MD
- Graded Wrinkling: Numerical Modeling of wrinkling phenomenon with altered geometries
