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  1. Hi together, There have been several questions about impeller and pump design with CAESES which is the reason for putting together the following brief summary: CAESES is used by several major pump makers (KSB, Ebara, Grundfos, DMW), mostly in the context of impeller and volute/casing optimization. In the context of turbocharger design, CAESES is used by e.g. MTU (large Diesel engines) for compressor and turbine optimization. There are free academic versions of the CAESES pro edition for students and PhD students as well as trial licenses, plus special editions for small companies, start-ups and freelancers. COMPARISON TO OTHER TOOLS Compared to other design tools on the market, CAESES focuses on automated design studies with your simulation tools. In most cases, there is already some sort of a baseline design that needs further optimization. Based on this design, a parametric CAESES model is created and automated. The possibilities for customization and shape fine-tuning are massive, so that specialized (company-specific) design processes can be completely defined in CAESES. No black box models etc. This is one important key issue, i.e., flexibility and full customization - besides the fact of having a 100% robust variable geometry for automated processes. IMPELLER BLADES There is functionality for creating parametric impeller blades (meridional contour definition, mapping from 2D onto 3D stream surfaces), which can also include analysis and optimization of the channel areas etc. See the turbomachinery section for more details. A water pump is described in this blog post. Any type of impeller can be parameterized, including complex shapes such as turbine scallops. VOLUTES Here is an overview with some animations. Basically, CAESES focuses on robust modeling of any volute type (in particular: turbochargers, pumps). Design constraints can also be built into the model, as well as typical controls (A/R distribution etc). The more complex your volute is, and the more problems you have to create new design candidates (automated), the more you should consider trying out CAESES. CFD AUTOMATION CAESES users also integrate their CFD and preliminary design tools. With this, a new design candidate can immediately be analyzed, directly within the CAESES GUI. Any open source, in-house or commercial tool can be coupled. You just need a batch mode for these tools. Excel sheets can also be accessed. For CFD analysis, the flow domain can be directly derived from the parametric impeller geometry. There is a CAESES ACT app available, to integrate CAESES into the ANSYS Workbench and to run optimizations with e.g. OptiSLang. MORE MATERIAL I recommend to browse through this page. Please find also attached a related presentation from the FRIENDSHIP SYSTEMS Users' Meeting 2013. I also added some related pics and animations. Unfortunately, it is not that easy to show more material since most data is confidential. Anyway, I hope this post helps a bit in terms of a quick overview. Cheers Joerg LAST UPDATE JULY 2019 UM2013-07-klemm-diffuser-design-for-multistage-pumps-with-FFW.pdf
  2. Hi all, Lately I've noticed that some of you, especially in automotive engineering, are interested in designing parametric intake ports, so here is one. For better comprehension I will explain the main steps I undertook. Modeling the pipe (See tutorial and/or sample "Sweep Surface") and the valve itself (simple surfaces of revolution) shouldn't pose much of a problem after completing a few basic tutorials in CAESES. The difficult part is to model the intersection area where the valve pierces the pipe geometry. Therefore I cut out an oval hole around the valve pin (see scope "02_domain_modeling"). In order to obtain a robust geometry, the remaining part of the trimmed surface has been split again into three subsurfaces (also to be found in the "02_domain_modeling" scope). The hole has then been filled with a meta surface that connects tangentially constant to the surrounding pipe and to an additional support surface perpendicular to the valve pin (01_valve|02_misc|support_surf). The meta surface has been created in circumferential direction around the (half) valve pin, see Screenshots. In the scope "03_functions" you can control the local shape of the meta surface. The blending function has influence on the connection to the support surface (1 = tangentially constant connection, 0 = perpendicular connection); speed_valve and speed_intake allow to manipulate the influence of the connecting surfaces on the meta surface. Use the mirror function in your 3D view to visualize the other half of the intake port, too. Try playing around with a few parameters that can be found in their according scopes. For more detailed insight into the meta surface creation check out the feature definition "contour_def" which holds the curve description that is used for the meta surface. the parameter "01_valve|03_motion|dz_norm" can be varied between 0 and 1 in order to close and open the valve respectively. "max_dz" in the same scope defines the maximum gap for an open valve. The .gif file should give you a few ideas how this fully parametric model can be varied, but you will probably have your own. Looking forward to questions or feedback, let me know if you think this sort of geometry could help you improve your intake port designs. Cheers, Jan 20140523_simple_intakePort.fdb
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