Gordon Murray Automotive T.50 'rear fan'

[freebeard]

So, what does Chapter 6 say? In your own words of course.

[aerohead]

Originally Posted by JulianEdgar

That is NOT how diffusers work! In fact, it is 100 per cent wrong.

Refer to Chapter 6, Race Car Aerodynamics (Katz) - and numerous other references.

I advise you to take it up with Volkswagen AG, and their Lamborghini division. I didn't build the car, take the photos, or publish them. I'm just the messenger.
Tufts never lie! Right?

[JulianEdgar]

Originally Posted by aerohead

I advise you to take it up with Volkswagen AG, and their Lamborghini division. I didn't build the car, take the photos, or publish them. I'm just the messenger.
Tufts never lie! Right?

Perfect example of how Aerohead operates here. Is completely wrong, won't refer to references that correct his misapprehensions, continues spreading misinformation.

[JulianEdgar]

Originally Posted by freebeard

So, what does Chapter 6 say? In your own words of course.

Just look up any reference. A diffuser does not work by "allowing low base pressure to communicate under the diffuser".

[aerohead]

Originally Posted by JulianEdgar

Perfect example of how Aerohead operates here. Is completely wrong, won't refer to references that correct his misapprehensions, continues spreading misinformation.

Is it too much to just accept information as it is. It's just information. I neither endorse nor reject reality. I just recognize reality as it's presented. It's not some grand conspiracy to spoil your party. It's about diffusers, so it's germane to the topic. Nothing more , nothing less. Please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[JulianEdgar]

Originally Posted by aerohead

Is it too much to just accept information as it is. It's just information. I neither endorse nor reject reality. I just recognize reality as it's presented. It's not some grand conspiracy to spoil your party. It's about diffusers, so it's germane to the topic. Nothing more , nothing less. Please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I guess this is why so much misinformation has been disseminated here.

To state the bleeding obvious - it is wrong information that you are spreading. Outright wrong. No nuance here - wrong.

How you say a diffuser works is simply quite wrong. So what do you do about it?

Nothing.

[freebeard]

In your own words:

A diffuser does not work by "allowing low base pressure to communicate under the diffuser"

This leaves the question of how it does work as an exercise.

So much contention. People should give it a little time to play out. I follow 2-Minute Papers a lot. It's not about air, but this one on tax policy has an interesting development at 4:20: https://youtu.be/Sr2ga3BBMTc?t=260. I'm a big fan of node-based editors, they go back to the Mac Plus and are pervasive in Blender.

There exists a free tool at https://github.com/PerceptiLabs/PerceptiLabs. Any one serious about settling the question [more than I] should take a look.

PerceptiLabs is a dataflow driven, visual API for TensorFlow that enables data scientists to work more efficiently with machine learning models and to gain more insight into their models. It wraps low-level TensorFlow code to create visual components, which allows users to visualize the model architecture as the model is being built.

This visual approach lowers the barrier of entry for beginners while providing researchers and advanced users with code-level access to their models.

[JulianEdgar]

Originally Posted by freebeard

This leaves the question of how it does work as an exercise.

No exercise is needed - just look it up.

There are literally hundreds of references that describe the basic operation of a diffuser (eg https://www.racecar-engineering.com/...-aerodynamics/). More complex explanations add vortex flow.

None of them show backwards airflow or the base pressure communicating under the diffuser.

As far as I can see, Aerohead is taking the misconceptions he applies to flow over the upper rear surface of a car (eg a notchback) and then applying them under the car in an inverted form.

[freebeard]

In your own words: "Just look it up."

[JulianEdgar]

Originally Posted by freebeard

In your own words: "Just look it up."

I don't understand.

Have you found a description of diffuser operation that matches Aerohead's description? I'll certainly be interested if you have.