hi Yong Wang, This is a good question. i believe this should be the way to go. For another project Mohsen is undertaking we also need to check out this feature so I am cc’ing him on the email so that we might iterate a bit as we test things out. Cheers, Spencer. Spencer Sherwin FREng, FRAeS Head of Aerodynamics Section, Director of Research Computing Service, Professor of Computational Fluid Mechanics, Department of Aeronautics, South Kensington Campus, Imperial College London, SW7 2AZ, UK Phone: +44 (0)20 7594 5052 http://www.imperial.ac.uk/people/s.sherwin/ On 14 Oct 2020, at 15:47, Yong Wang <yongwang.ttu@gmail.com<mailto:yongwang.ttu@gmail.com>> wrote: Hello Prof. Sherwin, I will recheck these modifications and submit a merge request. I also have a question about the simulation of flow around rotating bodies (such as bridge rotational VIV or flutter). I got stuck on setting up the case with the XYofXY coordinate transformation map (IncNavierStokesSolver produces segmentation fault) and haven't found related examples nor tutorials. I wonder if this approach is capable of simulating flow around rotating bodies in Nektar++ like in your papers (Li et al., 2002; Robertson et al., 2003a; Robertson et al., 2003b), or I made some mistakes in setting up the case (session file is also attached). Li, L., Sherwin, S.J., Bearman, P.W., 2002. A moving frame of reference algorithm for fluid/structure interaction of rotating and translating bodies. International Journal for Numerical Methods in Fluids 38, 187–206. https://doi.org/10.1002/fld.216 Robertson, I., Li, L., Sherwin, S.J., Bearman, P.W., 2003a. A numerical study of rotational and transverse galloping rectangular bodies. Journal of Fluids and Structures 17, 681–699. https://doi.org/10.1016/S0889-9746(03)00008-2 Robertson, I., Sherwin, S.J., Bearman, P.W., 2003b. Flutter instability prediction techniques for bridge deck sections. Int. J. Numer. Meth. Fluids 43, 1239–1256. https://doi.org/10.1002/fld.535 Best wishes, Yong wang Ph.D. Student National Wind Institute Texas Tech University Lubbock, TX, United States <CylFlow_Rot.xml>