The Algorithm Study Of Weak Coupling In Fluid-Structure Interaction

There are various kinds of problems regarding to fluid-structure interaction in projectslike the aerodynamic performance of all kinds of aircraft and the strength of ships andturbine blade. There are two general solutions concerning the fluid-structure interaction:the strong coupling method and the weak coupling method。The strong coupling method isseldom employed in reality. The weak coupling method has a separate calculation of flowfield and structure and produces the convergence solution by mapping data includespressure and displacement in fluid-structure coupling surface. The weak coupling methodnot only makes the solution easier to achieve, but also produces a more accurate result,sothis method plays a key role in calculating fluid-structure interaction.The thesis firstly has a general introduction of research situation home and abroadconcerning the weak coupling method and its basic framework; then has a elaboration ofbasic theories involved in the solution. It also introduces different calculation methodsused in this method and finally leads to the calculation approach described in the thesis.This thesis has a study of different calculation methods involved in the weak couplingmethod including search algorithm、matching criterion、data mapping and transmitting、fluid mesh updating and also further optimizes these calculation methods along withdescribing the derivation process of these calculation methods in detail.Finally, the thesis successfully proposes a program to realized the weak couplingmethod. A weak coupling method computing platform is formed by developing dateexchange interface between structure calculation software(ANSYS) and fluid calculationsoftware (FLUENT). Additionally, this thesis has a calculation of M6wing aeroelasticityproblem and rotating canard wing problem, which proves the accuracy and feasibility ofthe calculation method proposed in the thesis.