The pipe should have an appropriate length in order to prevent an impact from the boundary conditions to the pump stage itself. To prepare the CFD model we add an outlet extension downstream of the discharge diffuser. The shape of the cutwater will be automatically updated in our 3D viewer. Another possibility for creating the cutwater design would be to create a sharp intersection between the volute and diffuser. We can modify the radius and the spiral start position. On the right side of the window we configure diagrams and control functions to modify the shape of the discharge diffuser.įor the cutwater, we create a fillet radius instead of the default simple cutwater design. The diffuser becomes a radial type instead of tangential. The discharge diffuser will be made slightly longer and gets a different outlet diameter. Only minor adjustments to the discharge diffuser and to the cutwater will be done in this case.įirst we modify the discharge diffuser design. Again, we choose a semi-automatic mode here to design a volute with a circular cross-section. Our volute modeling is fully parametric and versatile. The next module design step is to create a volute. Hub and shroud solids as well as blades can be exported later into any CAD format or meshing tool for FEA analysis. Now we see hub and shroud model also in 3D. The description of hub and shroud contours will be part of the secondary flow path design which will be done later. This tool is very flexible for modeling hub and shroud geometry. For demonstration purposes we’re choosing a very simple model of the hub and shroud contour. For example, we can split the curves or transform them into Bezier splines. The user can adjust axial length of the impeller as well as shape and position of leading and trailing edges. All Bezier points can be modified numerically by changing numbers in the pop-up window. On the right side of the window there are diagrams for area progression, static moment, and curvature which can assist you in shaping the meridional contour of the impeller. In the meridional contour design window modifications of hub and shroud contours can be made as well as shaping repositioning of the leading edge. Immediately we can see a 3D model of the blades and the hub and shroud contour. By clicking the green check mark we complete the impeller design. In this example, we will make a semi-automated design by clicking on the green check mark at the bottom of the window. Now we add a new component choosing the radial mixed flow impeller option. On the right side, you’ll see the specific speed and the general machine type. The design point is defined by volume flow rate, head, and rotational speed. In this video, CFturbo be demonstrating a centrifugal pump design including a CFD simulation.įirst you create a new project choosing the pump design module.
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