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Assertion (A): Displacement thickness feeds back into the outer inviscid solution.

Reason (R): It measures how far the external streamlines are pushed out by the velocity deficit.

Select the correct answer from the options below.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both statements are true and the second explains the first. Because the layer thickens the effective body, the outer flow must be recomputed about that enlarged shape, and iterating between the two is how viscous-inviscid interaction methods work.

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