Travel grants for International students in the US?
Usually the best place to ask for a travel grant is the conference itself. I see, for example, that the APS DFD 2012 meeting had a travel grant program (sure, now it's too late to be useful). Many big conferences have such programs and those that do not may have "fellowships", which give a reduced registration fee for select students.

Otherwise you want to look at framework programs in your field encouraging the mobility of students. It is true that it might have been easier if you were actually located in India, because of binational exchange programs and such, but you also have to realize that the travel costs would then have been greater!