Abstract
We apply an implicit virtual boundary method with non-staggered coordinate grid system to zero thickness flat plate. Also we use a patch grid to reduce the calculating time and keep the accuracy at the same time. This method can solve the immersed boundary problem for a zero thickness flat plate accurately, no matter it is vertical or with arbitrary angle. We also apply a method to calculate a flying dragonfly, which we won’t need to assume the wings as elliptical geometries with thin thickness, but directly solve them as a zero thickness problem and successfully get the answer of flow and pressure field instead. Also, we may get the drag and lift coefficients. Due to the simulation in this case, we can gain many ideas different from the past. Consequently, the implicit virtual boundary method can successfully applied to many different problems.