Phoe interview was setup. The person speaking was friendly. He explained the answers the if I admitted that I didn't know the answer. I'm writing this part to just fill up the 30-word limit.

I applied online at the end of December and got replied quickly within several days to select a time for the phone interview. The interview took around half an hour with the form unrelated to your own research. Instead, it covers questions such as numerical methods, a 1-D fluid problem to describe governing equations and how to simplify terms, compressible flow, probability, etc., which recalled me of my PhD prelim-exam. My performance was not bad in my mind. However, the result after about 10 days made me disappointed.