  The use of adaptive spatial resolution to simulate flows of practical
interest using Smoothed Particle Hydrodynamics (SPH) is of considerable
importance. Recently, Muta and Ramachandran [1] have proposed an efficient
adaptive SPH method which is capable of handling large changes in particle
resolution. This allows the authors to simulate problems with much fewer
particles than was possible earlier. The method was not demonstrated or tested
with moving bodies or multiple bodies. In addition, the original method
employed a large number of background particles to determine the spatial
resolution of the fluid particles. In the present work we establish the
formulation's effectiveness for simulating flow around stationary and moving
geometries. We eliminate the need for the background particles in order to
specify the geometry-based or solution-based adaptivity and we discuss the
algorithms employed in detail. We consider a variety of benchmark problems,
including the flow past two stationary cylinders, flow past different NACA
airfoils at a range of Reynolds numbers, a moving square at various Reynolds
numbers, and the flow past an oscillating cylinder. We also demonstrate
different types of motions using single and multiple bodies. The source code is
made available under an open source license, and our results are reproducible.
