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How did Noach know which animals were tahor?
The Rabbi Chaim of Volozhin comments about this in his work, "Nefesh HaChaim, and says that the mefarshim say that Noach learned torah.
Which Mefarshim is he talking about?
This link mentions that it is discussed but does not specify where.
Rashi on the passuk 7:2
הטהורה. הָעֲתִידָה לִהְיוֹת טְהוֹרָה לְיִשְׂרָאֵל; לָמַדְנוּ שֶׁלָּמַד נֹחַ תּוֹרָה (שם פ' כ"ו): הטהורה
CLEAN—It means those cattle which will in future be permitted to Israel as clean; we thus learn that Noah studied the Torah
