There is no need, as it's in game. It's called a "refit". You sail to a friendly port (marked on the map with a dark blue anchor) or a sub tender (striped lighter blue anchor) and choose the refit option when you get the popup. It'll give you a full reserve of torpedoes and a full tank of diesel. If you were completely empty, after loading all the tubes, refit again. Now you have a full load of torps, a full tank of fuel, and can go back hunting again. No damage will be repaired.
Seriously, there wasn't an option for this in Silent Hunter III either.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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