Effect of an Upstream Extended Surface on Reduction of Total Drag for Finite Cylinders in Turbulent Flow

The effect of an upstream half-C shape body on the reduction of the total drag of a finite circular cylinder is investigated experimentally. Five main cylinders, each with an upstream half-C shape body placed at five upstream positions, a total of 25 different configurations, are considered during the experimentation at a Reynolds number in the range of 1.2 × 104 to 1.6 × 105. The aspect ratios of the main cylinders are 1.25, 2.09, 3.03, 3.78, and 4.90 and the upstream bodies are taken as 90° peripheral cut-outs of the respective main cylinder. The total configuration drag coefficient is calculated from the time-averaged drag force on the configuration and compared with the drag coefficient of the respective main cylinder. Results suggest that at least 20% of the total drag of the configuration might be reduced with the upstream half-C shape body, and the reduction varies with the main cylinders' aspect ratio and the upstream body placement distance. The maximum drag reduction is about 55% if the half-C shape body is placed at an upstream distance of 66% of the main cylinder diameter with an aspect ratio of 3.03 and at a Reynolds number of 1.8 × 104. A critical distance ratio is found beyond which drag cannot be reduced by the upstream half-C shape body, and the attribution might be given to a formation of intermittent swirling flow in the cavity mode.

show abstract

A Bio-inspired Approach to Heavy Vehicle Drag Reduction in Turbulent Flow using Shark Dermal Denticles

Sarker,

Das,

Islam

et al. 2024

SSRN Journal

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Effect of an Upstream Extended Surface on Reduction of Total Drag for Finite Cylinders in Turbulent Flow

Cited by 4 publications

References 0 publications

Enhancing formula student car performance: Nose shape optimization via adjoint method

Enhancing formula student car performance: Nose shape optimization via adjoint method

Reduction of Total Drag for Finite Cylinders in Turbulent Flow With a Half-C Shape Upstream Body

A Bio-inspired Approach to Heavy Vehicle Drag Reduction in Turbulent Flow using Shark Dermal Denticles

Contact Info

Product

Resources

About