grid generation
 

I am P G Thermal Sciences student from India.My M.Tech project is fluid flow analysis in rectangular channel with surface irregularities for a fully developed flow. Problem is elliptical.I am planning to do finite difference method for obtaining solution .Since there is irregularities along the crossection transformation is required.Can we use body fitted coordinate system for internal flow ? Is there any algorithm available for grid generation for internal flows ? I will be thankful for valuable suggestions.