Did a CFD Analysis on the MKI - Interesting - Page 2 - MR2 Owners Club Message Board
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post #21 of 178 (permalink) Old June 7th, 2007, 00:39 Thread Starter
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Another 2d-cutplot same as the previous, except that it is located at the vent. Notice
the upward air ruining the air near the spoiler.

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post #22 of 178 (permalink) Old June 7th, 2007, 00:41 Thread Starter
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Here's a picture of just the model. Next time I will play around with some wings.

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post #23 of 178 (permalink) Old June 7th, 2007, 02:37
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Wow, SP!!!

This is really killer. We finally have some relatively conclusive results... thank you so much for doing this.

But seriously, you still should help get me started in this so I can mess with it some more on my own. I'll e-mail you as soon as I get the chance... hopefully I can get my hands on a copy of solidworks for the summer.
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post #24 of 178 (permalink) Old June 7th, 2007, 02:40
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By the way, I would think that FloWorks would have some tool to integrate the pressure over the total body area to find a net pressure force... do you know of any way to do that? Or even just for a localized area like the spoiler or underbody?

Man, with the information we have now we should be able to find both coefficients of drag and lift... I gotta figure out how to do this!!
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post #25 of 178 (permalink) Old June 7th, 2007, 12:16
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Great work. Very interesting.

It seems that it might be of benefit to fight against the small flow of air that naturally comes out by pushing in with cool air. Less air total that if you fan air out of the lid, but the cooling affect for an IC might see. It would be interesting to see someone with a fan pushing out monitor intake temps. Then reverse polarity of the fan to pull air into the lid and see if that is better.

Also, it seems that those Tom's scoops that everyone has always said don't do anything might actually help quite a bit at cooling the compartment. I would think that the high velocity air going into them would be a much higher pressure than the rest of the bay, allowing it in.

The wing only affects CD a small amount, so no surprise there that it does not do much in your analysis. But when you model a higher wing it will be intersting to see how high it needs to be to have a decent affect. It is usually stated that roof line height is required to get much use out of them.

Thanks for all the work that was put into this.
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post #26 of 178 (permalink) Old June 7th, 2007, 15:45 Thread Starter
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Ok, I modified the engine bay a little bit and also added an engine and
transmission. This picture is a sectioned view at the centerline of the vehicle -
with a drivers side engine lid fan pushing down and the passenger side vent
open. Not much has changed from previous analyses. This time I have also
calculated the drag and lift forces and coefficients. They are as follows:
  • Drag Force: 161.4 lbF
  • Lift Force: 101.6 lbF
  • Coefficient of Drag: .332
  • Coefficient of Lift: .058

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post #27 of 178 (permalink) Old June 7th, 2007, 17:21
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I am sort of an amature aero-nut. Book and yarn-tuff taught.

I see some errors that are effecting other areas in a big way. I have to feed my brats, once I am done I'll list them.

this is the coolest stuff ever!

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post #28 of 178 (permalink) Old June 7th, 2007, 17:24
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can you do me a favor? Run the sim with the leading edge of the bumper flat like a 1985 mr2. do nothing else, just move the lower part back to make the leading edge parallel to the ground. I want to see what effect that has on the nose.

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post #29 of 178 (permalink) Old June 7th, 2007, 17:27
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the rear sunshade would aid in a big way on air flow on the rear butress area

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post #30 of 178 (permalink) Old June 7th, 2007, 17:49
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Also you are neglecting the side air vent into the engine compartment. Wouldn't this change the flow characteristics coming out of the engine lid?
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post #31 of 178 (permalink) Old June 7th, 2007, 17:51
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I doubt that the airflow through the side vent is more than negligible. But there are undoubtedly errors in the model. One of which is the radiator being solid. That would undoubtedly increase the airflow into the engine bay.
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post #32 of 178 (permalink) Old June 7th, 2007, 18:40
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no, the side fan is oly used to suck air in while at a stop light. the door mirrors actually reall kill any clean boundary layer in that area of the car. Removing the mirrors and adding smaller more aero mirrors will make a huge difference.
Those mirrors effect everything from the front tire back at high speeds

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post #33 of 178 (permalink) Old June 7th, 2007, 18:56 Thread Starter
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Bill how about some premium membership for aiding you with more analyses?
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post #34 of 178 (permalink) Old June 7th, 2007, 20:26
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I can do that. This is well worth it. thanks again.

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post #35 of 178 (permalink) Old June 7th, 2007, 20:55
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wtf! I made the model. SP gets lifetime gold and I get nothing???

: )
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post #36 of 178 (permalink) Old June 8th, 2007, 11:42 Thread Starter
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Bill can you elaborate on how you want the front end to look? Do you want me to model it like your airdam?
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post #37 of 178 (permalink) Old June 8th, 2007, 11:45
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the front bumper of the 84-86.. looks like this | while the 87-89 looks like this /

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post #38 of 178 (permalink) Old June 8th, 2007, 19:40 Thread Starter
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Ok, I made some interesting changes. I put a floor, or road surface, in and
specified it as a moving floor that moves at the same velocity as the air. This is
more realistic to what actually happens with a car on the road, and it made a
huge difference to the numbers. I added mirrors this time, opened up the area
on the bottom of the front cutout, and added a front lip.

drag: 216
lift: -69
cd: .44
cl: -.040


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post #39 of 178 (permalink) Old June 8th, 2007, 21:14
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is there anway I can help, I really want to do an mk2

is there anyway some one can send me a copy of the program possably? I would be more than happy to spend the time to create a mk2 model, Ive been waiting for some one to help me out
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post #40 of 178 (permalink) Old June 9th, 2007, 07:15
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I do not condone stealing engineering programs.
If you are a student the costs are very reasonable, starts at $88 and goes up.

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