I came across an interesting article on the Develop3D website, regarding the Immersed Boundary, meshless technique being used by Karalit in their CFD software. Their FAQ section is worth visiting. Posts about the above are available throughout popular forums like linked in.
They use a novel meshing technique where a structured mesh is super imposed on the existing mesh. The algorithm is claimed to be superior for transient physics and moving meshes. I hope this can be experienced in the 2D version.
Their 2D CFD software, named CFD vFD 1.2 can be downloaded for free by providing a few details for a registration form. It is a small package, 25 MB in size and they claim no limitations on the number of cores that can be used for the computation. It would definitely be useful for educational and experimental purposes.
OS compatibility : There are versions for different operating systems, including Windows and Linux versions. Windows 7 and Ubuntu, Open Suse were on the list, with x64 versions being available.
I must say, a wealth of information seems to be available if one types immersed boundary methods on Google. Though a summary can be found on Wikipedia, the original paper by Peskin can also be downloaded, which details the numerical concepts. ---------------------------------------------- - - - - - - - Update : Check out this article on Another Fine mesh , where John Chawner has some updates from ANSYS and CD-Adapco criticizing the Immersed Boundary Method. I agree with John's conclusion - "let the software stand on it's technical merits". The best evaluation of a simulation tool's performance is by comparing it with experimental evidence.