Open AccessAPPLICATION OF DATA ASSIMIMILATION FOR PARAMETER CORRECTION IN SUPER CAVITY MODELLING
Author(s) -
Tran Thu Ha,
Nguyen Anh Son,
Duong Ngoc Hai,
Nguyen Hong Phong
Publication year - 2016
Publication title -
vietnam journal of science and technology/science and technology
Language(s) - English
Resource type - Journals
eISSN - 2815-5874
pISSN - 2525-2518
DOI - 10.15625/0866-708x/54/3/6566
Subject(s) - drag coefficient , drag , data assimilation , function (biology) , mathematics , mathematical analysis , interval (graph theory) , mechanics , imperfect , motion (physics) , physics , classical mechanics , meteorology , linguistics , philosophy , combinatorics , evolutionary biology , biology
On the imperfect water entry, a high speed slender body moving in the forward direction rotates inside the cavity. The super cavity model describes the very fast motion of body in water. In the super cavity model the drag coefficient plays important role in body's motion. In some references this drag coefficient is simply chosen by different values in the interval 0.8-1.0. In some other references this drag coefficient is written by the formula with is the cavity number, is the angle of body axis and flow direction, is a parameter chosen from the interval 0.6-0.85. In this paper the drag coefficient is written with fixed and the parameter is corrected so that the simulation body velocities are closer to observation data. To find the convenient drag coefficient the data assimilation method by differential variation is applied. In this method the observing data is used in the cost function. The data assimilation is one of the effected methods to solve the optimal problems by solving the adjoin problems and then finding the gradient of cost function.