Evaluation of a propulsion calculation procedure using an actuator disk model featured in a RANS code
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School of Engineering |
Master's thesis
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Kul-24
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en
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ix + 64 s. + liitt. 15
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Abstract
This study was conducted in cooperation with Deltamarin Ltd, Finflo Ltd and ABB Marine. The target of the thesis is to evaluate an actuator disk model feature in the FINFLO RANS solver and to develop a calculation procedure for ship propulsion design. A potential flow theory based solver is used in order to obtain the running position of the vessel at a given velocity. The output data is used as input for simulation of towing and self-propulsion test with the FINFLO RANS solver. An actuator disc represents the propulsor in the self propulsion simulations. Panel method based software is used to obtain the force distribution over the propeller blade in open water conditions. The force distribution is then normalized and transformed for the actuator disc. The effective wake and the thrust deduction factors are approximated in order to calculate thrust and torque values to be used in the first iterations of RANS simulations. These values are calculated iteratively from propeller open water curves. RANS simulations provide values of total resistance and total inflow velocities in the propeller plane, which are used to calculate effective wake and to update the thrust and torque values. The simulations are stopped once the self-propulsion point has been reached, i.e. the thrust produced by the actuator disc is equal to the total resistance within the accuracy of 0.5 N. Finally, simulation results are compared with model test results.Description
Supervisor
Matusiak, JerzyThesis advisor
Ilkko, JuhoMattila, Mikko