{"id":3758,"date":"2026-03-10T14:03:36","date_gmt":"2026-03-10T13:03:36","guid":{"rendered":"https:\/\/simuneer.de\/uncategorized\/prediction-of-the-unsteady-flow\/"},"modified":"2026-03-10T14:08:20","modified_gmt":"2026-03-10T13:08:20","slug":"prediction-of-the-unsteady-flow","status":"publish","type":"post","link":"https:\/\/simuneer.de\/en\/case-studies\/prediction-of-the-unsteady-flow\/","title":{"rendered":"Prediction of the unsteady Flow"},"content":{"rendered":"\n

The Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM) of the University of Stuttgart, based in Germany, focuses its research on gas turbines, steam turbines and turbochargers. As part of the FVV-funded project \u201cBlade Forces\u201d, the Cadence software tools were utilized. The goal was to develop a workflow for the accurate, reliable and affordable prediction of forced response vibrations in radial turbines taking into account mistuning effects. A thorough validation of this workflow was conducted experimentally and numerically. <\/p>\n\n

\"CFD
Figure 1: CFD Model of the investigated radial turbine<\/figcaption><\/figure>\n\n

Meshing<\/h3>\n\n

On the numerical side, high-fidelity CFD models comprising block-structured grids were created with the automatic mesh generator Autogrid including details like the blade tip gap and fillets as well as the rotor scallop and backspace. The turbine volute was also included in the model. <\/p>\n\n

\"Mean
Figure 2: Mean static pressure and entropy contour at mid-span<\/figcaption><\/figure>\n\n

Nonlinear Harmonic Approach<\/h3>\n\n

The unsteady flow field in the turbine giving rise to the aerodynamic excitation was simulated by means of the innovative multi-rank Nonlinear Harmonic (NLH) frequency domain approach in Fidelity Fine Turbo. It leads to a comparable accuracy of the numerical results as the state-of-the-art time-marching models at significantly reduced computation costs. A validation with unsteady pressure measurement data showed remarkably good agreement and increased our confidence in this numerical method and in Cadence\u2019s solver. <\/p>\n\n

\"Comparison
Figure 3: Comparison of measured and simulated unsteady pressure in time and frequency domain at one sensor position in the rotor shroud<\/figcaption><\/figure>\n\n

Aerodynamic Damping<\/h3>\n\n

The aerodynamic damping in the turbine was also predicted by means of the NLH method. For this purpose, the mode shapes of the investigated resonance crossings as obtained from a prior modal analysis were applied as an elastic blade vibration with defined vibration amplitude. By utilizing the NLH method, the aerodynamic damping was computed also with high accuracy and low computation time. <\/p>\n\n

Given the excellent performance of Cadence\u2019s software tools, we look forward to employ them in other projects and to continue our cooperation with Simuneer as an academic partner.<\/p>\n\n

\"Figure
Figure 4: Distribution of the instantaneous blade surface disturbation pressure giving rise to aerodynamic excitation.<\/figcaption><\/figure>\n\n

Authors<\/h3>\n\n
    \n
  • Nikola Kovachev, Research Engineer <\/li>\n\n\n\n
  • Tobias M\u00fcller, Research Engineer<\/li>\n\n\n\n
  • Prof. Tekn. Dr. Damian Vogt, Institute Director, Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart <\/li>\n<\/ul>\n\n

    <\/p>\n\n

    References<\/h3>\n\n
      \n
    • Kovachev N., M\u00fcller T., Waldherr U., Vogt D., Prediction of Low-Engine-Order Excitation due to a Non-Symmetrical Nozzle Ring in a Radial Turbine by Means of the Nonlinear Harmonic Approach, ASME Paper, GT2019-90366<\/li>\n\n\n\n
    • Kovachev N., Waldherr U., Mayer J., Vogt D., Prediction of Aerodynamically Induced Blade Vibrations in a Radial Turbine Rotor Using the Nonlinear Harmonic Approach, ASME Paper, GT2018-76814<\/li>\n<\/ul>\n\n

      <\/p>\n","protected":false},"excerpt":{"rendered":"

      Developing a workflow for accurate, reliable and affordable prediction of forced response vibrations in radial turbines, taking into account mistuning effects.<\/p>\n","protected":false},"author":6,"featured_media":3757,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[67,70,75],"tags":[],"class_list":["post-3758","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-studies","category-cfd","category-turbomachinery"],"acf":[],"yoast_head":"\nPrediction of the unsteady Flow | Simuneer<\/title>\n<meta name=\"description\" content=\"Developing a workflow for accurate, reliable and affordable prediction of forced response vibrations in radial turbines, taking into account mistuning effects.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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