#Solidworks flow simulation propeller free
2ģ U is the relative free stream velocity or the velocity of the ship, and this is found by Froude scaling. 1 these dimensionless terms are found by this equation, Eq. J can be found with the following equation: Va : Advance velocity of the propeller or incoming flow velocity (m/s) n : Propeller rotational speed (RPS) D: Propeller diameter (m) The only unknown in this equation is the advance velocity, so J can be changed for a specified condition altering Va, but first the equation must be nondimensionalized Nondimensionalize the advance coefficient equation to solve for Va* J is already dimensionless, so the following equation is valid, Eq. KQ is the torque coefficient, KT is the thrust coefficient, and J is the advance coefficient. One of the goals of this simulation is to produce open water curves of KQ and KT at different advance coefficients. Links to Files: Part_1_J7_20deg.zip Part_2_J7_20deg.zipĢ Input.nml showing the necessary &surface_integrals change 2.2 Editing Parameters for Input.nml Each case has different operational parameters that simulate different speeds and angles of the incoming flow.
When the data analysis is conducted in Excel, each blade should follow the same trend but have a slight phase shift. Now each blade will report a file called Bld*.forces-moments. To do this, the Input.nml file had to be edited in the &surface_integrals part shown in the snapshot below. After this each blade was separated from the rest of the grids in Input.nml so Rex could output force-moment files for each individual blade and the hub. All the blades overlapped the hub at their respective connection point and caused orphan points, so the overlap was manually removed in Tecplot by identifying the overlapping nodes and blanking them. When designing the propeller grids, only one blade was created then rotated five times about the hub s rotational axis. A varying refinement ratio was used to center the refinement around the propeller when designing both the background and refinement grids. The background grid and refinement grids are boxes that surround the propeller. The total number of grid points is around 3 million.
#Solidworks flow simulation propeller software
There are three main sets of grids associated with these cases and they were all created using the software called Gridgen. These files include grids, Rex input (Input.nml), Suggar, input (Input.xml), post processing files, panel_weights file, and XINTOUT file. Table 1: KCS and KP505 dimensions and conditions Ship Model Length, Lpp (m) Ship Model Froude Number 0.26 Ship Reynolds Number 1.40E+07 Propeller Diameter, D (m) 0.25 Propeller Experimental Rotational Speed (RPS, rev/s) Simulation Setup All the necessary files to run these cases are provided. Table 1 contains the various dimensions, provided by the Tokyo 2005 CFD Workshop (2005) Case 2, needed to calculate necessary parameters. An open water curve will be generated and compared to experimental data.
The propeller will be simulated as an open water test for the KCS container ship at model scale, meaning just the propeller and hub. Crashback is a maneuver executed when the vessel needs to slow down quickly by reversing the rotation of the propeller, in which, oblique incoming flow angles are at their most extreme. COMPUTATIONAL NAVAL HYDRODYNAMICS Tutorial: Computation for KCS505 Five Blade Propeller in Crashback for Incoming Flows at 0, 10, and Problem description This tutorial contains all the information to simulate the KCS505 5-bladed propeller and hub while it is experiencing a crashback maneuver at different propeller advance coefficients (J) and incoming flow for each simulation case. Navy sponsor: Thad Michael, Naval Surface Warfare Center Carderock Division. This team ran reverse rotation at 9.5 rps to analyze a crashback. The team modified grids from Tutorial 5 (Pontarelli and Carrica 2016) to perform computations on uniform inflow at 0,10 and 20deg incidence angles. No data, except for 0 degree incidence angle. 1 KP505 Propeller in Oblique flow, Crashback: Tutorial 1 Objective: Predict thrust, torque, visualize vorticity structures.