Visit collaborators in Germany: visa type

I am a PhD student in the US and I have a co-author who is a professor at a university in Germany. In a few months I plan on visiting her to continue work on a project.

Her institution and grant will bear some of the expenses of my stay, but I am not getting paid for my time there. Does this fall under a business or tourist visa category?

Secondly, as she will remain a collaborator of mine for the foreseeable future, do I have a solid case for getting a multiple entry visa? (This would simplify my life significantly).

EDIT: As suggested by the comment. My intended stay is two weeks. I'm an Indian citizen in the US on an F-1.

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What is D type visa for Germany?

A D-Visa for employment enables you to travel to Germany and apply for a residence permit with the local immigration office (\u201cAusl\xe4nderbeh\xf6rde\u201d) or pursue an economic activity during the validity of the visa.

What is Type B visa for Germany?

Type B Visa For Transit The B Visa is also another visa for transit. This transit visa is required for those international travelers who wish to travel through the German territory en-route to their next destination. The maximum validity of this visa is 5 days.

What is Type C visa for Germany?

Schengen visa (for short stay visits) This short stay visa (category C visa) is valid for up to 90 days within a 180 day period in Germany and the entire Schengen area. The day you enter Germany or another Schengen country marks the start of the 180 day period.

What is Type D visa?

Type D Schengen visa or national long-stay visa The national visa is the type D long-stay Schengen visa. It is mandatory for any foreigner wishing to study, work or live in a Schengen country for longer than 90 days (up to 1 year).

TYPES OF VISA IN GERMANY (WHICH IS THE RIGHT?)

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