Valveless pulsejet-computational fluid dynamics

Moderator: Mike Everman

Re: Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Fri Apr 28, 2017 5:38 pm

Mike Everman wrote:Oh, that one is fun to watch! I would love to see the pressure animation as well. Does it not make sense that the velocity scale should be -300 to +300m/sec? Loses that "hot-cold" spectrum, but freezing it would allow some better interpretation.

Will surely post the pressure plots in my next simulation. -300m/s i dont think so, the velocity reduces to about 0.06m/s near outlet, i took this as ref and setup the velocity limits in scene plot.
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Re: Valveless pulsejet-computational fluid dynamics

Postby Mike Everman » Fri Apr 28, 2017 5:46 pm

The velocity has a direction vector left and right. Maybe a silly thing I'm wondering, as we see the propagation of the velocity changes, which does indicate a change in direction.
I'm trying to wrap my mind around whether I can be fooled by interpreting the propagation of the velocity change with gas movement direction. I mean, is it possible that a gas movement could be going opposite to the visual movement of the colors?
Mike
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Re: Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Fri Apr 28, 2017 6:27 pm

Actually there will be a velocity motion in opposite direction during suction phase from exhaust and intake side but velocity does not show in negative value (i.e positive velocity in reverse direction). In this video the motion of colours represents the movement of mass either in froward or reverse direction.
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Re: Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Sun Apr 30, 2017 6:17 am

Another valveless type numerical simulation but this time its single intake chinese type. Its really interesting to see the things happening inside the PJ.

https://youtu.be/FgFmT-_KZfA
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Re: Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Thu May 11, 2017 2:21 pm

A just for fun simulation.

Video link:
https://youtu.be/AlN7lFJ826o
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Re: Valveless pulsejet-computational fluid dynamics

Postby Mike Everman » Thu May 11, 2017 2:47 pm

Ha! Nice. Oh yeah, I need to dig up jet dimensions for you!
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Re: Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Mon May 15, 2017 1:46 pm

Another just for fun numerical simulation. This was fun creating.
https://youtu.be/VdnT-rudMb8
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