Revista Brasileira de Ensino de Física
On-line version ISSN 1806-9126
MEDINA, Cesar. Flow patterns after different reference frames. Rev. Bras. Ensino Fís. [online]. 2005, vol.27, n.3, pp. 429-433. ISSN 1806-9126. http://dx.doi.org/10.1590/S1806-11172005000300021.
In a diagnostic exam on fluid mechanics, in which students are asked to draw flow diagrams of a simple geometry case, there is an apparent confusion associated to reference frame changes. As a didactic tool, we propose a comparative analysis of flow diagrams on different relative movement conditions of the same system, consisting in a cylindric pipe containing liquid and a small spherical object. Such diagrams are velocity maps and streamlines obtained through numerical solutions of Navier-Stokes equation.
Keywords : flow patterns; streamlines; velocity maps; reference frames; numerical solutions.