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Basics : Imposed Move

When doing FSI, it is possible through the keyword ICFD_CONTROL_FSI to trigger one way coupling i.e either only the fluid has an influence on the solid's displacements or only the solid has an influence on the fluid's flow pattern. The latter case is often used. However, this implies setting up the solid problem, solving it and communicating the solid's displacement and velocity to the fluid solver during the run which the fluid solver will then use to up move the volume mesh. In order to reduce calculation time and increase accuracy, it is often wise to directly impose the displacements on the fluid nodes through the use of the ICFD_CONTROL_IMPOSED_MOVE keyword.