Recent content by Stan Butchart

I am here again after everyone has gone home. While there is some good stuff here, I am surprized that no one has brought up Kutta. It is the nature of fluid to WANT to pass an object equally to both sides. Because the flow cannot pass upwards around the sharp trailing edge, flow on top of...

Getting back to the complications of thr Bernoulli principle__ When I decouple the tangetial velocity as it is typically givrnm relative to the wing, I find that most of it comes from the velocity of the wing. The remaining component, which is the actual air velocity, does not describe a...

In the long run you might be right.If we only want numbers the Bernoulli Equation dos just fine. However, most of the thousands that search the web and books are only looking to uderstand the lifting process. The largest percentage of the hundreds of articles and sites firmly define the...

The only point here was that the Bernoulli Principle was not at work along the surface but that the Bernoulli Equation was, based on normal acceleration.

One last shot. we have a fluid that is moving relative to the remote air. We have a body that is moving relative to the remote air. The body and moving air are moving relative to each other. I mark the lip of a glass and place it upside down on the table and rotate it. (I should accelerate...

The point is to present an understanding to the hundreds that search these pages. Bernoulli is based upon differences in the speed at different points in the inertial flow. Speed calculated related to different points on the surface does not reflect the actuual inertial flow. Bernoulli...

Right, relative to the surface it is not. However, while it moves along the surface it is moving thru space at 1V because the cylinder is moving. My reason to continue to pursue this is to try to understand better how to convey concepts. (Which I am failing!) You might give...

Absolutly right! However, I have been trying to get across the velocity relative to the remote field. The reason was to show that the Bernoulli Principle did not apply tangent to the surface. Converting the flow relative to the surface to relative to the field is a pretty simple process. (As...

Oohh yes it is! This is all in friendship but communication is difficult. I am looking at the inertial path relative to the remote still air only. The flowpath is as a lower case script "e". Look up the source/sink pattern for the cylinder. While it is an instantaneous picture, all of the...

I certainly hope that it did not come across that way. If it did I apologise. The cylinder is constant speed, stag point to stag point.

Yah, I realized tha halfway through my post but it was too late to stop! But tell me, it is moving at 1V at the stag point and .2V at the top ( all relative to the remote air.) How is that not slowing down?

[FONT="Arial"][SIZE="2"] Just found this thread and thought I would throw out a bananna peel just for fun. The flow (ideal) next to a cylinder is accelerated to the velocity of the cylinder at the fwd stag point. It remains at constant 1V speed until the aft stag point. The flow (ideal)...