Potential Flow Forces and Moments from Selected Ship Flow Codes in a Set of Numerical Experiments. Appendix E - Time History Plots for Prescribed Pitch Motion of Model 5613
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
Pagination or Media Count:
This appendix contains all the plots and tables for the simulations involving 1-DOF prescribed pitch motion of Model 5613 scaled to the length 154 m. Each of Figures E-1 through E-300 contains time-history plots of the results from all codes for a single variable during one period of motion. If the code runner did not supply the data, the data vanish identically, or the data are insufficient for a single period, there is no curve for that code. The lack of data in any figure has been noted immediately below the figure. In addition, if a quantity vanishes due to port-starboard symmetry, it is not plotted. As necessary, the time that appears on the horizontal axis has been shifted so that the pitch angle is of the form theta thetaa sin omega t for some amplitude thetaa and some frequency omega. Furthermore, the time t has been replaced by t mod Te where Te is the period of the motion. Tables E-1 through E-600 contain information related to the results depicted in the figures. Two tables follow each figure. The first table gives estimates of the mean value and the amplitudes and phases of the first and second harmonics obtained by Fourier analysis. The second table gives the minimum and maximum of the variable plotted in the figure. The minimum and maximum of both the filtered and unfiltered variable are provided. The plot itself was obtained from unfiltered data unless the data were already filtered by the code runner, as is the case for the results from NFA. Appendix O contains plots and tables for the behavior of the minimum and the maximum of each variable plotted in this appendix versus the pitch amplitude thetaa. In the prescribed motions of task 1, the amplitudes and frequencies for the simulations assigned to each code runner are the same for both Model 5514 and Model 5613 and for both speeds corresponding to Froude numbers 0.0 and 0.3. For prescribed pitch motion, they are given in the main part of the report and are also here for ease of reference.
- Numerical Mathematics
- Computer Programming and Software
- Marine Engineering
- Fluid Mechanics