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April 21, 2021

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April 14, 2021

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Vector Hysteresis in Solenoid

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely. Maxwell by Ansys enables users to assign different materials. It also enables users to add customized B-H curve. In this video, we will be using this feature to study an armature and draw its hysteresis curve.

A geometry is imported, excitations are assigned, and we illustrate how to assign material and their B-H curve. In order to make simulation faster, a 30 degree(1/12) section of the armature is chosen. Picture below shows final B-H curve and the imported geometry.

 

Vector Hysteresis in Solenoid

 

Turbomachinery Simulation

Rotating machines are extensively used in many industries such as Aerospace, Automotive, Datacenters Cooling, IT-Hardware, Medical devices, Energy, Oil and Gas, HVAC. Most common rotating machines are fans, pumps, compressors, and turbines.

The biggest challenges for delivering the future rotating machines are improving performance and reliability in addition to decreasing the cost. Aeroacoustics and NVH is becoming more and more important as the cars and devices are getting quieter and quieter. Improving efficiency and performance while decreasing noise and vibration could be predicted using high fidelity simulation methods.  Ansys as a simulation lead in the market has very accurate workflows for modeling rotating machines. The initial design could be done in legacy tools such as Vista and BladeGen from which a high-quality 3D CAD may be exported to flagship meshing tool and solvers. TurboGrid is a custom-built mashing tool for turbomachines that can generate a high-quality grid in several simple steps in a very short time. CFX is the recommended tool in Ansys portfolio for rotating machines as it has a turbo mode that can make setting up the model much more convenient. Postprocessing is quite easy and powerful in CFD-Post using the turbo tab.

CFturbo is a new tool that can be added as an extension and could replace Vista and BladeGen for the conceptual/initial design stage. It makes it very convenient and easy for engineers to tweak the geometry of the turbomachine. CFturbo is totally compatible with Ansys Workbench and allows the parametrization of geometry and can export to meshing engines which makes it a perfect tool for optimization.   Engineers can refine designs easily before physical tests are performed, accelerating the process while reducing risk and cost.

Simulating turbomachinery applications is usually time-consuming due to its complicated nature.  Only Ansys, with its powerful portfolio and its custom-built convenient turbomachinery workflow, is up to the challenge. More and more companies have used Ansys successfully for various rotating machine applications.

 

The following video series would include the following items on turbomachinery modeling:

Outline:

  • Introduction
  • Axial Fan
  • Mixed Compressor
  • Meshing
  • Solution
  • Postprocess

To learn more on how to perform CFD analysis on turbomachinery devices, please watch these videos:

Ansys Random Vibration (PSD) Analysis

Random Vibration (PSD) Analysis with Ansys Mechanical

The purpose of random vibration analysis is to determine the response of structures to vibration loads that are random in nature. An example would be the response of a sensitive electronic component mounted in a car subjected to the vibration from the engine, pavement roughness, and acoustic pressure.

The frequency content of the time history (spectrum) is captured along with the statistics and used as the load in the random vibration analysis. This spectrum, for historical reasons, is called Power Spectral Density or PSD. In a random vibration analysis, since the input excitations are statistical in nature, so are the output responses such as displacements, stresses, and so on.