So Wednesday’s post was really only a warm up for today’s! This is a fantastic super-super slow mo of a shock wave in our supersonic wind tunnel. Shock waves are very thin regions where the flow properties rapidly change. The oscillation of these shock waves can cause damage or fatigue to aeroplanes or other supersonic vehicles, so the study of this oscillation can be very important.
Here the flow is from left to right and the dark, vertical, black line is the normal shock while the slightly fainter lines are oblique shocks coming from the contraction. The actual video was 8 minutes long but represented only 0.5 seconds in real time. That’s slowed down by almost 1000 times! As with Wednesday’s post the shock waves are visualized using Schlieren photography.
(The movement seems mesmerising, perhaps good for a screensaver?)
What kind of set-up inside the tunnel is generating the pattern of oblique shocks and the unsteady normal shock? It’s almost like this is video from inside a diffuser section of the tunnel if the flow is moving left to right. Or are you still adjusting the geometry to reliably start the supersonic flow in the test section?
We want to create an index of the lady scientists on Tumblr, much like shychemist did for all scientists. (Have we thanked you lately?!) However, it’s a bit more challenging as not all of you announce your gender on your blogs. So, if you identify as a woman/female,* let us know if you want to…
Today is FYFD’s 1000th post! It’s been a wild ride over the last three-and-a-half years and I cannot thank you all enough for coming along. I’m continually amazed by FYFD’s popularity among readers of all ages and backgrounds, and it’s truly a joy to see excitement for fluid dynamics spreading.
The keen-eyed among you may have noticed a subtle change to the main page: I successfully defended my PhD Friday! I’m still working on wrapping my head around the idea of not being a student any more.
Anyway, I just wanted to take a few minutes to celebrate. I encourage you to take a look back at the archives, which are full of amazing science and physics, or read one of the themed series FYFD has featured. And, if you’ve enjoyed the blog, please don’t hesitate to spread the word! Thank you all again for your support. :-)
(Congratulations on your defense!)
(This guy is really great)
Thank you! Although actually I (FYFD’s author) am female. :)
The Pope and his bike. Can’t get a full glimpse of the gruppo, but it does appear to be in line with Francis’ downscaled approach to papal finery. It’s certainly a contrast the Gold Colnago of John Paul II, though in his defense, Karol Wojtyla was an avid cyclist and outdoorsman before becoming pope.
Now there’s a Popemobile I can get behind! Though it’s got to be hard to ride with those long robes.
Thanks for the hat-tip, cheesedicks.
Here’s some further reading on how not to be a cheesedick on the Internet.
(and yes, I know it came from this post because I cropped it down from the original screenshot. I can’t know if Chain Reaction grabbed it directly, but they didn’t source ANYONE so eff them anyway.)
So in all honesty, I’d never heard of the Curator’s Code (and I’ve always disliked the phrase “hat-tip”), but it’s neat to see an effort to standardize levels of attribution. So, thanks, cyclocosm, for giving me a new tool to use in my blogging.
Also, why would anyone want to look like Taylor Phinney? Really.
Cyclo-Cross at the Winter Olympic Games … why not?
The new IOC President Thomas Bach put out a clear message of change and modernisation for the Olympic Sports Programme at the 126th IOC session in Sochi this week, and the UCI is keen to be part of this refreshing outlook.
I believe that Cyclo-Cross - which takes place during the northern hemisphere winter – would be an exciting addition to the Winter Games.
Cyclo-cross requires endurance, explosive power and incredible bike handling skills. Many youngsters wishing to take up cycling pass through the school of Cyclo-Cross, and the breathtaking performances of the Junior athletes at the recent UCI World Championships in Hoogerheide clearly demonstrated the depth of young talent around the globe.
YES. YES. PLEASE YES.
HOW I FEEL WHEN MY DEFENSE IS NEXT WEEK
It’s 3 weeks away rather than next week, but the feeling is pretty much the same.