Prandtl LectureNorbert Peters (RWTH Aachen): Turbulence statistics along gradient trajectories Monday, April 18, 2011, 10:00 - 10:45, Stefaniensaal Dissipation elements are defined as the spatial region from which the same pair of maximum and minimum points in a scalar field is reached. By calculating gradient trajectories starting from every grid cell in direction of ascending and descending scalar gradients a local maximum and a local minimum point is reached. In the seminar the motivation to study them and recent results are presented. In particular the derivation of an evolution equation for the length distribution function and the relation to scaling laws are discussed. A particular point of interest is the testing of the model equation for the mean dissipation, which is often used in engineering applications. [1] L. Wang, Phys. Rev. E 79, 046325 (2009) [2] L. Wang, N. Peters, J. Fluid Mech. 554 (2006) 457-475 [3] L. Wang. N. Peters, J. Fluid Mech. 608 (2008) 113-138 |