The phrase "the warm smell in the kitchen greets me at the door" is an example of personification. It attributes the human action of "greeting" to a smell, which is not a human trait.
To clarify:
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Metaphor: A direct comparison between two unlike things, implying one is the other (e.g., "Time is a thief").
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Onomatopoeia: A word that phonetically imitates the sound it describes (e.g., "buzz," "sizzle").
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Simile: A comparison using "like" or "as" (e.g., "as brave as a lion").
So, in your example, you have personification. If you need help with finding examples of metaphor, onomatopoeia, or simile, let me know!