I am studying turbulence with the aid of CFD by solidworks, actually I have a confusion about the inlet , outlet,ideal wall and real wall...
Yes you are doing it right.
Just in case, you should know that you must set the walls of your tank as real wall if the extent of your tank is limited relative to the robot in real life, and you wish to set the conditions and capture the physics as closer to the real testing tank. Otherwise, if your tank is quite large such that the robot and the wall doesn't have any significant effect on each other's flow characteristics then the wall should be taken as ideal.
Your robot is going to stay as real wall because obviously friction drag is going to be their and needs to be considered under turbulent conditions.