General Mechanical

General Mechanical

Where to put VFOPT command

    • solani
      Subscriber

      Hello eveybody

      Because of changing geometries in my simulation I need to use the VFOPT command but I am not sure where to put this command. Can anyone help?

      Here is my code so far:

      SF,InnerInsulationSurface, rdsf,0.9,1 ! radiation settings
      SPCTEMP, 1, 22 ! ambient temperature in case enclosure is open
      
      stef,5.67e-8 ! stefan boltzman constant
      toffst,273.15 ! temperature offset
      
      VFOPT, new !forcing new calculation of few factors
      hemiopt,10 ! resolution of view factor calculation
      tunif,22 ! initial temperature
      

      Thank you for your help

      Ani

    • Erik Kostson
      Ansys Employee
      Hi

      You would need to add an apdl command object under the thermal solution and use it for all load steps:

      See here for some info:

      Thank you

      Erik

    • solani
      Subscriber
      Thank you Erik for your very very fast reply. I selected the wanted step for my APDL command. But now I am a bit confused: What are load steps? Equals the number of load steps to the number of Number of Steps that you can control in the Analysis Settings?
      However what I wanted to ask in my post is the following: Does it matter where I put the VROPT command? So like this

      SF,InnerInsulationSurface, rdsf,0.9,1 ! radiation settings
      SPCTEMP, 1, 22 ! ambient temperature in case enclosure is open

      stef,5.67e-8! stefan boltzman constant
      toffst,273.15! temperature offset

      VFOPT, new !forcing new calculation of few factors
      hemiopt,10 ! resolution of view factor calculation
      tunif,22 ! initial temperature
      or like this
      VFOPT, new !forcing new calculation of few factors

      SF,InnerInsulationSurface, rdsf,0.9,1 ! radiation settings
      SPCTEMP, 1, 22 ! ambient temperature in case enclosure is open

      stef,5.67e-8! stefan boltzman constant
      toffst,273.15! temperature offset


      hemiopt,10 ! resolution of view factor calculation
      tunif,22 ! initial temperature
      I know from Python or Java that the place in the code matters. I thought it would be the same for Ansys. Therefore my question is where to put the VFOPT command in the code.
      Thank you again in advance.
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