Read the full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50078 DOI: 10.4236/ojfd.2014.43025 Author(s) Ehsan Yari, Ahmadreza Ayoobi, Hassan Ghassemi ABSTRACT This paper offer an artificial neural network (ANN) model to calculate drag force on an axisymmetric underwater vehicle by obtaining dataset from a computational fluid dynamic analysis. First, great effort was done to calculate the pressure and viscous data forces by increasing the precision and numerical data in order to extend and raise quality of dataset. In this step, numerous different geometry models (configurations of axisymmetric body) were designed, examined and evaluated input parameters including: diameter of body, diameter of nose disc, length of body, length of nose and velocity whereas outputs contain pressure and viscous forces. This dataset was used to train the ANN model. Feed-forward neural network (FFNN) is selected which is more common and suitable in this field’s study.EWW140930GJR A three-layer neural network was opted and after training this network, the results showed good agreement with CFD data. This study shows that applying the ANN model helps to reach final purpose in the least time and error, in addition a variety of tests can be performed to have a desired design in this way. KEYWORDS Drag Force, Feed-Forward Neural Networks, Back-Propagation Algorithm, AUV