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# Acceleration

Question | Answer |
---|---|

What is the lagrangian frame of reference? | A fluids property as it changes in time |

What is the Eulerisn frame of reference? | A fluids property at a particular position in space. |

What is a pathline? | The history of the position of a single particle. |

What frame of reference is a pathline? | Lagrangian |

What is a streakline? | A line connecting all the particles that have passed through the same point at an instant in time. |

What is a streamline? | A line which is tangent to all velocity vectors? |

What frame of reference is a streamline? | Eulerian |

How do you derive the equation of a streamline in 2D? | Solve the following equation ∫v dx = ∫u dy |

How do you derive the equation of a streamline in 3D? | Solve the following equation dy/v = dx/u = dz/w |

What are the characteristics of a steady flow? | Is not time dependent and streamlines, streamlines and pathlines are the same. |

What is acceleration? | Rate of change of velocity a = dV/dt where V = f(x,y,z,t) |

What is convective acceleration? | Acceleration due to a fluid particles change in position in space. = u dV/dx + v dV/dy + w dV/dz Eulerian |

What is local/temporal acceleration? | Acceleration due to time. = dV/dt Lagrangian |

What is a stagnation point? | A point where a fluids velocity is equal to 0. |

When is flow parallel to an axis? | When the velocity is 0 in other directions. |

Created by:
Katherine Ann Thurecht