Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Prandtl–Meyer expansion | Statement: [Ludwig Prandtl, notableFor, Prandtl–Meyer expansion]

Target entity: Prandtl–Meyer expansion
Context triple: [Ludwig Prandtl, notableFor, Prandtl–Meyer expansion]

• A. Mach cone
  A Mach cone is the conical shock wave pattern produced by an object traveling through a medium at a speed faster than the speed of sound.
• B. Callahan flow
  Callahan flow is a notable basaltic lava flow associated with Medicine Lake Volcano in northern California, formed during one of its relatively recent volcanic eruptions.
• C. Joukowski airfoil
  The Joukowski airfoil is a mathematically defined airfoil shape derived using conformal mapping, foundational in early aerodynamic theory and airfoil design.
• D. Kármán vortex street
  Kármán vortex street is a repeating pattern of swirling vortices formed when a fluid flows past a bluff body, fundamental in fluid dynamics and aerodynamics.
• E. Venturi effect
  The Venturi effect is a fluid dynamics phenomenon in which a fluid's pressure decreases and its velocity increases as it flows through a constricted section of pipe or channel.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Prandtl–Meyer expansion
Triple: [Ludwig Prandtl, notableFor, Prandtl–Meyer expansion]

The Prandtl–Meyer expansion is a compressible-flow phenomenon and corresponding mathematical solution describing how supersonic gases smoothly turn and accelerate around convex corners through a fan of expansion waves.

Target entity: Prandtl–Meyer expansion
Target entity description: The Prandtl–Meyer expansion is a compressible-flow phenomenon and corresponding mathematical solution describing how supersonic gases smoothly turn and accelerate around convex corners through a fan of expansion waves.

• A. Mach cone
  A Mach cone is the conical shock wave pattern produced by an object traveling through a medium at a speed faster than the speed of sound.
• B. Callahan flow
  Callahan flow is a notable basaltic lava flow associated with Medicine Lake Volcano in northern California, formed during one of its relatively recent volcanic eruptions.
• C. Joukowski airfoil
  The Joukowski airfoil is a mathematically defined airfoil shape derived using conformal mapping, foundational in early aerodynamic theory and airfoil design.
• D. Kármán vortex street
  Kármán vortex street is a repeating pattern of swirling vortices formed when a fluid flows past a bluff body, fundamental in fluid dynamics and aerodynamics.
• E. Venturi effect
  The Venturi effect is a fluid dynamics phenomenon in which a fluid's pressure decreases and its velocity increases as it flows through a constricted section of pipe or channel.
• F. None of above. chosen