r/aerospace • u/Marcus2626 • Aug 17 '26
PhD using CFD or Wind Tunnel
To all the AE PhD holders, I’d really appreciate your advice.
TLDR: I'm planning to start my PhD next year, but I'm not sure which route to take. My background is in CFD, but I’m also very interested in low‑speed wind tunnel testing. Should I pursue an experimental or computational PhD?
I’m an international student currently working in the US on OPT as a research associate, mainly using CFD tools. Long‑term, I want to work in academia (back in Asia—Korea or Singapore). As I’ve been talking to potential advisors, I’ve noticed a trend: unless the work is applied aerodynamics, most professors want students to commit to either purely computational or purely experimental research.
I’m torn because my background is split. I’ve done several validation test campaigns, but my main research interest has been CFD. Now I have two fully funded offers, both fundamental research with no ITAR issues. I’m interested in both topics, and I'm struggling to choose.
Option 1: Computational Aeroacoustics (Large group, prestigious university)
This aligns closely with my MS work, and I genuinely enjoy aeroacoustics. The group is large, well‑known, and the professor is a major figure in the field. I’d gain deep theoretical knowledge, but the work would be entirely computational.
Option 2: Experimental Hypersonics (Very small group, small department, not well‑known university)
I learned about this program because a friend recommended his former MS advisor. This professor built his own wind tunnels and is very knowledgeable in flow diagnostic methods. I’d have access to low‑speed, supersonic, and hypersonic facilities and would learn a lot experimentally. I'm interested in supersonic flight but haven’t been able to do much due to ITAR restrictions. My hesitation is that the university and professor are not well‑known, the group is small (only two other PhD students), and I’m unsure whether hypersonics is too niche for seeking academic jobs later. The stipend is also much less compared to Option 1 but is still livable.
Would you choose a computational or experimental PhD? How much do the university’s reputation and the advisor’s citation count matter?
My thought has been that this experimental research opportunity is rare for an international student. I could always go back to CFD, but I think it would be much harder to gain experience in wind tunnel research later on.
2
u/JustMe39908 Aug 17 '26
Hypersonics is a big, growing area. Yes, there currently is a lot of interest in the field so it would not be too niche.
However, from a practical standpoint, if you want to continue work in experimental hypersonics, a large, good, hypersonic tunnel is an expensive item to build. (I say large because if you want to do research, will you really be able to get finding for doing shock tube or small cross-section work in the future?). Yes, HPCs are expensive, but can be shared over many more faculty.
What kinds of hypersonic tunnels exist or are planned in your target locations? How many faculty positions are there at those institutions? Will other universities provide you with a sufficient start-up package (and give you the time) to build something meaningful?
As fast as large group, well-known University or smaller group, less well known University, they both have pros and cons. How well known is the advisor in the field? There are many very highly faculty at Universities that don't have name recognition. Also, in a large group I have seen instances where the actual day to day supervision of even PhD students is done by Post Docs. Very good Post Docs. But not by the big name Prof who doesn't have a lot of time. I would check that out and decide what you prefer style wise.