Pretty much has been said in different ways, but in the US and I believe in most of Europe that I have visited <G>, a visual approach is an IFR approach that is done visually and in VMC. There is NO published missed approach for a normal visual approach. In the US there are some charted visual procedures and there can be a charted miss also. But the norm, is that if for some operational reason you must go around, you do so and then reenter the pattern for a normal landing. There is no missed approach. Now if you have a mechanical issue and you want to get some altitude and go sort it out, you just have to ask and the tower will talk with approach or center whoever has the IFR jurisdiction and get you some climb out instructions. Hope that this is as clear as mud...
regards
Scott