en Submarine Hydrodynamic & Design مقاله پژوهشي Research Paper <span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:">To obtain the hydrodynamic forces acting on a solar-powered AUV, and to investigate the effects of the free surface, a model of this type of vessel was simulated in ANSYS FLUENT 18 commercial software. To validate the data, a vessel with a scale of 1: 1 compatible with the installation of photovoltaic panels was built and tested in the towing tank of the National Iranian Marine Laboratory (NIMALA). The standard k-&epsilon; model and multi-block mesh were used to simulate the three-dimensional unsteady viscous flow around these cases: individual struts, the body without struts, and the body with struts. Three depth-to-diameter ratios (</span></span></span> <span cambria="" math="" style="font-family:"><m:ctrlpr></m:ctrlpr></span> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>h</m:r></span></span></span></i> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>d</m:r></span></span></span></i> <span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r><m:rpr><m:scr m:val="roman"><m:sty m:val="p"></m:sty></m:scr></m:rpr> =3.6 , 4.5 , 5.2</m:r></span></span></span> <span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:7.5pt"> </span></span></span></span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:">) and six Froude numbers in the range of 0.06</span></span></span> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>~</m:r></span></span></span></i> <span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:4.0pt"> </span></span></span></span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:">&nbsp;0.35, equivalent to the Reynolds range</span></span></span> <span cambria="" math="" style="font-family:"><span style="font-style:italic"><m:ctrlpr></m:ctrlpr></span></span> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>2.4&times;10</m:r></span></span></span></i> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>05</m:r></span></span></span></i> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r> </m:r></span></span></span></i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r><m:rpr><m:scr m:val="roman"><m:sty m:val="p"></m:sty></m:scr></m:rpr>to</m:r><m:r><i> 1.4&times;</i></m:r></span></span></span> <span cambria="" math="" style="font-family:"><span style="font-style:italic"><m:ctrlpr></m:ctrlpr></span></span> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>10</m:r></span></span></span></i> <i><span style="font-size:11.0pt"><span style="line-height:107%"><span cambria="" math="" style="font-family:"><m:r>06</m:r></span></span></span></i> <span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:4.0pt"> </span></span></span></span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:">, were used to obtain lift and drag coefficients. The findings of this study were used to create a solar AUV. The maximum percentage of struts contribution in the total resistance force is 62 percent. The generated resistance effect, caused by struts and their attachment to the body, also plays a significant role. According to the current study data for the analyzed model, its maximum value is around 41 percent.</span></span></span> solar AUV,hydrodynamic coefficients,CFD,towing tank 1 14 http://ijmt.ir/browse.php?a_code=A-10-7170-1&slc_lang=en&sid=1 Ehsan Asadi Asrami easadiasrami@gmail.com 10031947532846004062 10031947532846004062 Yes Azad university of Takestan Mohammad Moonesun m.moonesun@gmail.com 10031947532846004063 10031947532846004063 No Shahrood University of Technology, Faculty of Civil Engineering