Fountains (negatively buoyant jets) are commonly used in numerous engineering applications, such as the natural ventilation buildings and smoke spread compartment fires. In this study, long-term behavior of weak round fountains homogeneous ambient confined a cylindrical container was analyzed using three-dimensional direct numerical simulation over range Froude number ( Fr ), Reynolds (Re), dim...

Aims. Nonlinear behaviour of galactic dynamos is studied, allowing for magnetic helicity removal by the galactic fountain flow. Methods. A suitable advection speed is estimated, and a one-dimensional mean-field dynamo model with dynamic α-effect is explored. Results. It is shown that the galactic fountain flow is efficient in removing magnetic helicity from galactic discs. This alleviates the c...