3-DIMENSIONAL TRANSIENT FLOW OF SPIN-UP IN A FILLED CYLINDER WITH OBLIQUE GRAVITY FORCE

Three-dimensional transient Bow profiles of spin-up in a fully liquid filled cylinder from rest with gravity acceleration at various directi ons are numerically simulated and studied. Particular interests are co ncentrated on the development of temporary reverse flow zones and Ekma n layer right after the impulsive start of spin-up from rest, and deca y before the Bow reaching to the solid rotation. Relationship of these flow developments and differences in the Reynolds numbers of the flow and its size selection of grid points concerning the numerical instab ilities of flow computations are also discussed. In addition to the gr avitational acceleration along the axial direction of cylindrical cont ainer, a series of complicated flow profiles accompanied by three-dime nsional transient flows with oblique gravitational acceleration has be en studied.