Swooshing noise as car drives near obstacles

  1. As you drive with your windows open you can hear a sound due to some continuous stream of air that is hitting your face, or whatever. But why is it then, that when you drive past by some obstacle, like a tree, you hear a swooshing noise? What is causing this?
     
  2. jcsd
  3. jedishrfu

    Staff: Mentor

    Could be the car's own motor noise and air turbulance noise being imperfectly reflected from the tree back to you and acting like a doppler effect.

    http://en.wikipedia.org/wiki/Doppler_effect
     
  4. Typically you're hearing tire, mechanical, and maybe some aero noise being reflected back to you. It's especially obvious when you drive next to a wall.

    If you're driving close enough to a tree that your airflow is interacting noticeably with the tree, then you may want to back off a bit. :smile:
     
  5. sophiecentaur

    sophiecentaur 13,389
    Science Advisor
    Gold Member

    Very well put. I laughed.
     
  6. Borek

    Staff: Mentor

    You finally hear how noisy your car is.
     
Know someone interested in this topic? Share a link to this question via email, Google+, Twitter, or Facebook

Have something to add?

0
Draft saved Draft deleted