In fluid mechanics a Riabouchinsky solid is a technique used for approximating boundary layer separation from a bluff body using potential flow. It is named after Dimitri Pavlovitch Riabouchinsky.[1][2]
Riabouchinsky solids are typically used for analysing the behaviour of bodies moving through otherwise quiescent fluid (examples would include moving cars, or buildings in a windfield).
Typically the streamline that touches the edge of the body is modelled as having no transverse pressure gradient and thus may be styled as a free surface after separation.
The use of Riabouchinsky solids renders d'Alembert's paradox void; the technique typically gives reasonable estimates for the drag offered by bluff bodies moving through inviscid fluids.
References
- ^ Gleb Mikhailov. "Riabouchinsky, Dimitri Pavlovich". Encyclopedia Krugosvet (Rus.).
- ^ "Sur le calcul des valeurs absolues par D. Riabouchinski" (PDF). Compte rendu du Congrès international des mathématiciens tenu à Strasbourg du 22 au 30 Septembre 1920. 1921. pp. 231–242.