7 Replies Latest reply on Oct 14, 2013 8:45 PM by Jared Conway

    Impeller Heat Transfer Analysis

    Andrew Paino

      I am trying to map results from a 2D thermal study onto a 3D surface to perform heat stress analysis in a static study. The analysis is being done on an impeller so the 2D cross section was initally created by revolving the hub and shroud to create a solid mass for the impeller. This works perfectly to model the heat transfer 2 dimensionally, but to model the corresponding stress from the resultant temperatures in the same manner is not accurate, due to fillets and things of that nature.

       

      Therefore, does anyone know how to extract those resultant temperatures from 2D heat transfer analysis and apply them to a 3D static analysis? I know usually you can apply results in the thermal effects option, if the geometry is the same.

       

      Also, I have found the nodal temperatures from the 2D study are listed in the CWR file if the mesh is not too fine. I have tried directly editing these temperatures in notepad but most of the file is encrypted and will not read into a static study once the temperatures have been altered. Is there a proper way to open and manually edit CWR files? If so I could most likely map it to a 3 dimensional surface with relative ease.

       

      If a parasolid would be helpful I may be able to upload something, just let me know.

       

      Thanks in advance for anyone who helps!

       

      Thanks,

      Andrew

        • Re: Impeller Heat Transfer Analysis
          Jared Conway

          what is going to happen in 3d that a 2d thermal stress analysis isn't going to work?

           

          i don't believe there is a way to pass that information across. you'd have to manually plug it in by splitting the body.

           

          modifying the cwr is not supported.

            • Re: Impeller Heat Transfer Analysis
              Andrew Paino

              The maximum stress in an impeller is often seen at the outer diameter in the blade's fillet, for this reason it is extremely important to understand how the temperatures create stresses in that location. In a 2D analysis, the fillet is totally overlooked and the resultant stresses are shown to be significantly lower than they actually are.

               

              I have applied various split lines along the blades but the changes in temperature from the leading edge to the trailing edge are too extreme to get accurate results (without putting in over a dozen split lines). Ideally I would like to map the resultant temperatures exactly to each node, but I don't know if that will be possible if modifying the cwr is not an option.

              • Re: Impeller Heat Transfer Analysis
                Andrew Paino

                I thought the below images would be helpful in understanding what exactly I'm trying to do. The 2D picture is a meridional view of the impeller shown below, with the flowpath approximately marked between the dashed lines.

                 

                2D.jpg

                3D.jpg