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Drag curve for a lifting body in steady flight. Parasitic drag, also known as profile drag, [1]: 254 [2]: 256 is a type of aerodynamic drag that acts on any object when the object is moving through a fluid. Parasitic drag is defined as the combination of form drag and skin friction drag. [3] [1]: 641–642 [4]: 19
Skin friction drag is generally expressed in terms of the Reynolds number, which is the ratio between inertial force and viscous force. Total drag can be decomposed into a skin friction drag component and a pressure drag component, where pressure drag includes all other sources of drag including lift-induced drag. [1]
Parasitic drag, or profile drag, is the sum of viscous pressure drag (form drag) and drag due to surface roughness (skin friction drag). Additionally, the presence of multiple bodies in relative proximity may incur so called interference drag , which is sometimes described as a component of parasitic drag.
The Roblox Studio interface as of August 2024. Roblox Studio is the platform's game engine [26] and game development software. [27] [28] The engine and all games made on Roblox predominantly uses Luau, [29] a dialect of the Lua 5.1 programming language. [30] Since November 2021, the programming language has been open sourced under the MIT License.
Therefore, the drag coefficient can often be treated as a constant. [13] For a streamlined body to achieve a low drag coefficient, the boundary layer around the body must remain attached to the surface of the body for as long as possible, causing the wake to be narrow. A high form drag results in a broad wake. The boundary layer will transition ...
is the drag coefficient – a dimensionless coefficient related to the object's geometry and taking into account both skin friction and form drag. If the fluid is a liquid, c d {\displaystyle c_{\rm {d}}} depends on the Reynolds number ; if the fluid is a gas, c d {\displaystyle c_{\rm {d}}} depends on both the Reynolds number and the Mach number .
In software engineering, a unity build (also known as unified build, jumbo build or blob build) is a method used in C and C++ software development to speed up the compilation of projects by combining multiple translation units into a single one, usually achieved by using include directives to bundle multiple source files into one larger file.
is the frictional force – known as Stokes' drag – acting on the interface between the fluid and the particle (newtons, kg m s −2); μ (some authors use the symbol η ) is the dynamic viscosity ( Pascal -seconds, kg m −1 s −1 );