Jump to content

Jörg

Moderators
  • Content Count

    503
  • Joined

  • Last visited

Community Reputation

28 Excellent

About Jörg

  • Rank
    Moderator

Profile Information

  • Gender
    Male
  • Location
    Berlin, Germany

Recent Profile Visitors

342 profile views
  1. Here is a recent article about turbine wheel optimization where the blades and the scallops can be optimized at the same time within a fully-automated process. Such a "complete" and variable model allows you to consider the aerodynamic performance (CFD) and the stress characteristics of each generated design. Comes with a set of nice animations.
  2. Hi together, With version 3.1, you have the additional skinning option for meta surfaces. This allows you to have a low number of generating cross sections (curves in surface direction) while matching given boundary curves, also called rails. See the attachment for a simple example. In former versions, one solution to approximately match such boundaries has been to increase the number of cross sections - which is expensive and increases the data of the resulting NURBS surface. Here, this new skinning method is a good alternative to the existing auto-cubic point interpolation. Finally, when it comes to the new BRep type that also comes with version 3.1, it is even recommended to exactly match boundaries for further processing such as Boolean Operations and fillet modeling. Cheers Joerg metasurface_skinning.fdb
  3. Hi together,   The pro edition of CAESES comes with a set of algorithms for design exploration and formal optimizations. However, people often already use an external optimization software in their company (such as HEEDS, Isight, modeFrontier, Optimus, optiSLang etc). In this case, one can make use of the batch mode of the CAESES pro edition, in order to automatically generate geometry design variants, using the given optimization tool.   I attached a small setup (sweepbatch.zip) which demonstrates how simple this works:   sweep.fdb Project file that contains the geometry model along with its design variables. sweep.fsc ASCII file that controls the batch run. It starts CAESES, sets the values of the design variables and exports an STL file. This fsc-file is the one that needs to be manipulated by the external optimization software, i.e. parameterize the values of the design variables (see the "setValue"-command). run.bat Run this file to execute the entire process.   The run of sweep.fdb also writes out the number of open edges into a file called "openedges.dat". It is merely a simple check for a closed STL geometry, and this information can be used as well by the optimization tool (geometry validity check).   Cheers Joerg   PS: check out this related post as well.   UPDATE AUGUST 2017: The call in the bat/script file needs to be   "C:\Program Files (x86)\FRIENDSHIP-SYSTEMS\CAESES\bin\win64\CAESES_crt.exe" sweep.fsc   with the newer versions of CAESES (and not CAESES-FFW).
  4. 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
  5. CAESES provides comprehensive functionality for propeller and fan designers so that it can be used as an expert blade design software. Basically, any kind of propeller blade (e.g. boat propeller, aircraft propeller, blowers, fans etc.) for any application can be created with it. CAESES focuses on the variable geometry of blades for design explorations and shape optimization (mostly, together with CFD). Here is a screenshot for an axial blade design, taken from one of the samples that are shipped with CAESES: For general information about modeling of propellers, see the MARINE SECTION. For other rotating machines, please see the TURBOMACHINERY SECTION. 2D PROFILES 2D profiles can be defined by the user. These can be either parametric (e.g. camber curve + thickness distribution) or based on profile data from an air foil data base. There are models available with special definitions such as Wageningen B-Series. NACA curves are also available in CAESES via the menu > curves > naca. When generating the 3D propeller surface, the profile parameters can be changed by means of radial functions for each 2D parameter (e.g. chord, camber, thickness). IMPORT AND EXPORT In order to import or export the blade in a proprietary format, feature definitions can be used which allows you cope with e.g. company-specific ASCII formats. The PFF (Propeller Free Format) is directly supported. EXTERNAL TOOL / CFD AUTOMATION Any preliminary design tool (XFOIL etc) or even CFD packages (in-house, open source, commercial) can be integrated so that a new design can be analyzed within CAESES. BLADE ANALYSIS There is a functionality that can analyze an imported blade surface (given as NURBS) to give you the chord, rake, skew, pitch, thickness and camber distributions. CUSTOMIZATION There is a lot of scripting possible in CAESES so that any specialized design process can be fully transferred into the platform. For instance, if you use Excel sheets for your profile definitions, you can access them through CAESES but also re-implement your methods using the feature definition programming editor. EXAMPLES Some propeller design case studies can be found in this section. If you are interested in drone design, then check out this post here. Here are some videos - the last one I put there only to give you an impression about how the geometry controls can be wrapped and accessed for applying changes, this can be done for all other types of blades as well. Wageningen Propeller ModelPropellerBlade Tip DesignGeometry Changes for an Axial Fan (and a Ship Hull) - Demo Video ONLINE TOOL Finally, check out the new online geometry creator for the Wageningen B-Series. Browser-based, intuitive web app.Allows you to generate typical B-Series propellers with just a few clicks.Requires very little propeller design expertise.The final geometry can be downloaded as STL or STEP file. LAST UPDATE JANUARY 2018 Note that there are FULL FREE ACADEMIC versions of the pro edition CAESES for students and PhD students as well as trial licenses with variable time frames. There are also special editions for small companies, start-ups and freelancers.
×
×
  • Create New...