How Do I Symbolically Evaluate a Double Integral with an Offset Circle?

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Discussion Overview

The discussion centers around the symbolic evaluation of a double integral involving a differential element within an offset circle. The integral in question is ∫∫ r dA, where the circle is offset from the y-axis and has a specified radius and center location. The context includes both theoretical and applied aspects, particularly in relation to calculating angular momentum in fluid dynamics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Experimental/applied

Main Points Raised

  • One participant seeks assistance in symbolically evaluating the integral ∫∫ r dA within an offset circle, specifying the circle's center and radius.
  • Another participant requests clarification on the question and suggests uploading a diagram for better understanding, while also inquiring if the question pertains to schoolwork.
  • A participant clarifies that the question is for research purposes, not homework, and describes the goal of calculating angular momentum induced by flow into a cylinder through an offset, inclined tube.
  • The participant references a journal paper for methodology but expresses uncertainty about the integration process for the specified area.
  • Diagrams are mentioned as being relevant to the discussion, illustrating the geometry involved.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the evaluation method for the integral, and multiple viewpoints regarding the context and requirements of the question are present.

Contextual Notes

The discussion includes references to specific geometrical configurations and the need for visual aids, indicating potential limitations in understanding without additional context. The integration method remains unspecified and unresolved.

Mark_ca_101
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Hello,
I am new to the forum and need some help understanding how to evaluate this integral symbolically.

∫∫ r dA

The differential element lies within a circle that is offset from the y-axis by some value R2, and the radius of the circle is R1. Again, the circle center location is (0,R2).

Any help would be greatly appreciated.
 
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Mark_ca_101 said:
Hello,
I am new to the forum and need some help understanding how to evaluate this integral symbolically.

∫∫ r dA

The differential element lies within a circle that is offset from the y-axis by some value R2, and the radius of the circle is R1. Again, the circle center location is (0,R2).

Any help would be greatly appreciated.
Welcome to the PF, Mark.

Can you please explain this question a bit better and Upload a diagram of the geometry? Also, is this a question for your schoolwork? If so, I can move it to the Homework Help forums as long as you show your initial work toward the solution. :smile:
 
berkeman said:
Welcome to the PF, Mark.

Can you please explain this question a bit better and Upload a diagram of the geometry? Also, is this a question for your schoolwork? If so, I can move it to the Homework Help forums as long as you show your initial work toward the solution. :smile:

berkeman,

This is not a homework problem, this is for research.

I want to calculate the angular momentum induced by introducing flow into a cylinder by an offset, inclined tube. I have referenced a journal paper regarding this method, but I'm not clear on how they are integrating this area. Please see the diagram below.

For simplicity reasons, the S1 area is shown as a circle, while it would actually be an ellipse.[PLAIN]https://www.physicsforums.com/attachments/da-png.113264/[PLAIN]https://www.physicsforums.com/attachments/inflow-angular-momentum-png.113265/
 
Last edited by a moderator:
Mark_ca_101 said:
berkeman,

This is not a homework problem, this is for research.

I want to calculate the angular momentum induced by introducing flow into a cylinder by an offset, inclined tube. I have referenced a journal paper regarding this method, but I'm not clear on how they are integrating this area. Please see the diagram below.

For simplicity reasons, the S1 area is shown as a circle, while it would actually be an ellipse.[PLAIN]https://www.physicsforums.com/attachments/da-png.113264/[PLAIN]https://www.physicsforums.com/attachments/inflow-angular-momentum-png.113265/[/QUOTE]
dA.png
inflow - angular momentum.png
 
Last edited by a moderator:

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