2 Replies Latest reply on May 17, 2013 11:27 AM by Stuart Gunn

    Flow Simulation - Mass Flow Rate of a model

    Stuart Gunn

      Hi All,

       

      I'm trying to find out a way of measuring the Mass Flow Rate within a Flow Simulation Analysis.

      (I have SW 2013 Premium with the Flow Simulation package and the Electronic Cooling Module)

       

      The only results of this type that I can get are at the inlet and outlet of my model as they are setup as boundary conditions (and perforated plates).

      What I would ideally like is a cut plane graph of the mass flow rate similar to those of Velocity and Temperature.

       

      I have tried adding in a none heat reactive part (insulator) that I could measure the Mass Flow Rate on but it still effects the model.

      Does anyone have any tips and tricks on how to achieve the readings I'm looking for?

       

      The model is of an electronic enclosure with 2 Resistor components, PCB, HDD, Heat Sinks, fans and heat pipes.

      The area I'd like to know the Mass Flow is within the Heat Sinks but anywhere within the model will do.

       

      I realize this is post processing but I have a feeling something needs to be added to allow the results in post.

       

      Any tips will be appreciated.

      Thanks


      Stuart

        • Re: Flow Simulation - Mass Flow Rate of a model
          Jared Conway

          Hi Stuart, mass flow rate is an integral parameter so it needs a face of some sort to be read off. Based on your description it seems like you've got to that point. But what it sounds like you will want to do is use component control to disable that component before you run your simulation so that it doesn't affect your analysis. Flow will pass right through it but you'll be able to use the volume to measure things within it or you can use the face to read things like mass flow or volume flow rate.

           

          The trick is though, this has to happen before you run the analysis. If you add it after the fact, it isn't part of the mesh and flow simulation can't read things off of it. There are a few enhancement requests along this line in the SWX kb but that's how it is right now.

           

          If the analysis takes a long time to run, your closest bet would be to create a cut plot of velocity, map out manually some areas within the channel..etc that you'r interested in, find an average velocity in that area and then convert to volume flow rate and then do the same for density to get density. it won't be exact but can work in a pinch if you forgot to add the componet for reading before you run the analysis.

           

          side note, one of the things we teach in our mentoring service is to set these up as goals. that way the value is locked in and easy to export by just looking at your goal plot.

            • Re: Flow Simulation - Mass Flow Rate of a model
              Stuart Gunn

              Hi Jared,


              Thanks for the info, I figured it was along those lines but just couldn't get the simulation to work when adding in a part with a face where I needed the readings, I thought I had disabled it in component control already but It's worth double checking. And yes, the simulation does take a little time (Currently at 3+ hours) and I need to run several variations and gather the same readings from all of them.

               

              I already have the inlet and outlet as mass flow goals so I know what the system does, I just needed readings in specific areas within the model, sounds like i need to add in a few more parts...

               

              Thanks

              Stuart