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acupro last won the day on October 3

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  1. 1. That warning indicates there are fluid volume elements on both sides of the indicated surface. You should not have volume mesh inside the wheel itself. 2. I also see this in the Log file: acuSolve: *** y+ is negative number You may have other issues with the setup as well. Can you post the .inp file generated for the run? (Not the mesh itself, just the .inp.) You may also be better off contacting the Altair support team in India.
  2. If I understand correctly, you want to show streamlines on a plane, where the streamlines neglect the out-of-plane velocity component. Is that correct? If that is not correct - what do you mean by '2D Streamlines'? Can you share an image comparing 2D and 3D streamlines for the same case? If my assumption is correct - that you want to neglect the out-of-plane velocity component, try the following. This assumes you want a Z-normal plane, and the Z-velocity component is neglected. 1. You need to create a vector using only the X- and Y-velocity components. In the Function Specification, use this: UnitX*"x-velocity" + UnitY*"y-velocity" then give it the name you desire. 2. When you create your streamlines on a Z-normal plane (Z - Coordinate Surface), use that vector function just created for 'Vector Function' instead of the default 'Velocity'. I'm not 100% positive on this - but does that accomplish what you want?
  3. My guess would be that static pressure would be typical, as that is simpler to measure, and doesn't obstruct the flow. Simply drill a hole in the side of the inlet and outlet pipes and put a tube there - flush to the inner/wetted surface. A total pressure measurement requires a pitot probe - where you install a device that protrudes into the flow and bends such that it points directly into the oncoming flow. I assume there's no harm in reporting both, but I would guess static pressure rise is typically reported.
  4. The pre-built mapping/transfer tools are only available for shell and/or solid elements. You may try contacting your local Altair support team to see if there are scripts that might work with beams.
  5. The equation given in the tutorial compares static pressure. If you want to compare total pressure, then your expression would be correct. It depends on what you want to compare - static or total.
  6. Based on my quick look at the database, you do not have the interface surface attached to the Rotor volume - only that for the Fixed/main volume. Right-click 'Air-rotor' under Volumes and select Mesh Op. > Find Missing Surfaces. This will generate the other set of surfaces, attached to the Rotor Volume. It appears you already have two sets of nodes there, but the surface definition was missing. This new surface set should have the same treatment as 'interface' > deactivate Simple BC, and activate Interface Surface with 0 for gap and gap_factor. If you know or can estimate the angular velocity, it's simpler to use rotation mesh motion rather than rigid body. It's difficult to estimate the resistance to rotation due to the gearbox, etc, so the angular velocity / rotation from Rigid Body motion is probably going to be higher than the actual would be.
  7. Turning off multi-field option in Auto Solution Strategy is not enough. (In fact, it shouldn't even appear there...) It needs to be turned off in Problem Description (becomes EQUATION command in the .inp). In Problem Description, Multiphase equation should be set to 'None'.
  8. Looks like there are setup/definition issues in the .inp file. Is this a single or multi-fluid simulation? You could share the .inp file, or contact Altair Support for assistance (which is probably your best bet).
  9. That is not an error, just a warning, and would not stop the calculation. There must be something else. You can post the complete .Log file, or contact your local Altair support team.
  10. The image does represent Q Criterion, colored by something like velocity magnitude or pressure. You should create in isosurface of Q Criterion, then select a value for Q Criterion that gives you the 'look' you want. In the function calculator, you would put the velocity function - the vector - inside the parenthesis.
  11. They may have slightly different default density and viscosity values. You'll need to make sure whichever you choose to use, that the material properties are correct for your operating conditions.
  12. Assuming you're not running ideal gas, etc, and only interested in relative pressure differences, the default pressure = 0 should be fine. And you can use that at all the outlets where you have Simple BC outflow and integrated BC mass flux.
  13. I do see Integrated BC available for Inflow / Outflow SBC types. But I can't seem to get Element BC anywhere. (This is with HM 2019.1) What specifically do you need through Integrated and/or Element BCs? Have you contacted Altair Support about this yet? They may be able to give better answers regarding what's available in HM.
  14. If you've already meshed the model in HyperMesh, you can continue setting up the model there, as I believe the up-to-date releases of HyperMesh support and write out the input files taking into account the mixed topologies. Is there a reason you wish to bring the mesh to AcuConsole rather than setting up the model in HyperMesh? Other than hand-editing the model to incorporate the new commands that would take into account mixed topologies/elements, you could also convert all elements to tets. In AcuConsole, that would be Mesh Op > Mesh to Tet. That leaves you with all tets and tris.
  15. I'm guessing that there's an inconsistency in AcuConsole, where a value can be input for mass flow rate in the EBC. I would suggest you use the Integrated BC. For an outflow, the value would be positive, whereas for inflow, the value would be negative. (The definition includes the surface normal.) Best practice for such a situation is to use Simple BC with type = outflow, then add the Integrated BC and the mass flux option.
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