3.4.3 Including Lateral Drag on Surrounding Flow

In typical fiber simulations, the axial drag of the fibers is the most important force acting on the fibers as well as on the surrounding fluid. In some situations, the lateral or cross-flow drag can become important. This is the case when the fibers are mainly cooled or dried in a cross-flow situation. In such cases you can select Include Lateral Drag under Options in the Fiber Model dialog box (Figure  3.4.1). The drag is estimated for a cylinder in cross-flow and is shown in Equation  2.8-2. Lateral drag is not considered by the fiber equations and therefore lateral bending of the fibers is not considered.