Ahmed body
The 'Ahmed body is a benchmark geometric model widely used in the field of automotive aerodynamics and computational fluid dynamics (CFD). It serves as a simplified, generic representation of a road vehicle, allowing researchers to study complex flow structures—such as stagnation, separation, and wake dynamics—without the complexities of a real-world vehicle geometry.[1]
History
First proposed by S.R. Ahmed and G. Ramm in 1984, the Ahmed body is a "bluff body" designed to capture the essential aerodynamic characteristics of modern automobiles. By using a standardized, replicable shape, it enables engineers to validate CFD solvers and compare experimental wind tunnel results across different institutions.[2]
Geometry
The model is characterized by a relatively simple, box-like shape with:[3]
- Rounded leading edges at the front to mimic the front fascia of a car.
- A rectangular midsection connecting the front to the rear.
- A movable slanted rear deck: This is the most critical feature, as the slant angle can be adjusted to study how different rear geometries influence flow separation and drag.
References
- ↑ "Airflow over an Ahmed Body". COMSOL. 2026-05-27. Retrieved 2026-05-27.
- ↑ "Ahmed body -- CFD-Wiki, the free CFD reference". CFD Online. 2021-07-03. Retrieved 2026-05-27.
- ↑ https://dergipark.org.tr/en/download/article-file/3288363. Retrieved 2026-05-27. Missing or empty
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