Fluids

Fluids

Boundary condition definition in fluent

    • cfdexplorer
      Subscriber

      I am simulating a room with a man and have to define a boundary at man's mouth( i select mouth surface) for representing inhalation and exhalation. So, for this i made a table file with time and mass flow rate columns and generated data points using sine function and time step 0.001 for 2.5 seconds. I loaded the table using fluent console. I am wondering what type of boundary condition should i use to define the mouth, because the mouth acts as both outlet (during inhalation) and inlet (exhalation). Please see my udf file graph attached.

    • Rob
      Ansys Employee
      Convert to a velocity boundary and it'll allow flow to be +/- as per the values in the graph. n
    • cfdexplorer
      Subscriber
      Thank you for the answer. So, instead of mass flow rate, i should give the velocity values ? Velocity inlet condition, Correct?n
    • Rob
      Ansys Employee
      Yes, we used to be able to do this with direction vectors in the mass flow boundary but that caused issues with some of the other models. Velocity boundary is safer. n
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