About Michael Tooley

Michael Tooley is a Lead Technical Services Specialist at ANSYS, Inc., specalizing in Fluid Structure Interaction simulations. Michael holds a Masters Degree in Mathematical Engineering from the University of Leeds, England and is based in ANSYS’ Waterloo office in Canada.

Coupling Piezoelectric and Fluid Simulations

ink jet nozzle

Ink jet nozzle

Piezoelectric devices surround us in our everyday life. Our cars and trucks contain many piezoelectric devices, including fuel level sensors, air bag deployment sensors, parking sensors and piezoelectric generators in the wheels to power the tire pressure monitoring system. Your smartphones or tablet contains piezoelectric sensors that detect the motion and orientation of the device, which my kids were using to good effect to play “Need For Speed” yesterday. Many of us have ink jet printers at home, which can use piezoelectric printer heads to eject thousands of drops per second. Continue reading

Transferring Forces from Fluent to System Coupling

A common question I hear from System Coupling users, particularly when using an operating pressure in ANSYS Fluent other than atmospheric pressure, is “Which pressure is used when transferring forces from Fluent to System Coupling and how do I change it?”.

The simple answer is that the forces passed to System Coupling are based on the gauge (or solved) pressure in Fluent by default. More accurately, the gauge pressure minus the Reference Pressure is used, but the Reference Pressure is zero by default so this is equivalent to the gauge pressure.

Before going further let’s review the Operating Pressure, Reference Pressure and gauge pressure.

The Operating Pressure in Fluent should be set to a typical absolute pressure in the system. Pressures set at boundary conditions are then specified relative to the Operating Pressure. Often the Operating Pressure is set to the absolute pressure at an outlet, and then a relative (gauge) pressure of zero is set at the outlet boundary condition(s). Continue reading

Fluid–Structure Interaction Using System Coupling

With the release of ANSYS 14.0, ANSYS Fluent users can perform two-way fluid–structure interaction (FSI) simulations using the ANSYS next-generation coupling technology — system coupling.

The system coupling component in ANSYS Workbench offers a generic way to couple two or more participants in the Workbench environment. In release 14.0, you can link Fluent and ANSYS Mechanical via system coupling to facilitate FSI simulations.

This post provides a broad overview of the capabilities offered with system coupling and the types of cases you can solve. I’ll try to avoid just listing the features. Continue reading

Effective Use of the ANSYS Workbench Project Schematic

If you’ve used the project schematic in ANSYS Workbench for any length of time then you’ve probably tried linking cells together that you just aren’t allowed to link. Or perhaps you’ve found yourself duplicating Mesh or Setup data manually. Here we’ll explore some tips and tricks and consider various workflow scenarios and show you how to make the schematic work for you. Continue reading

Thermal Stress Results From Your CFD Simulations

After performing a conjugate heat transfer (CHT) simulation in ANSYS Fluent or ANSYS CFX software, you may be interested in the thermal stresses generated in your model. ANSYS Workbench 13.0 makes it easy to perform this type of analysis by transferring the volumetric temperature field from your CFD solution and applying it as a body temperature load in a static structural system. Continue reading

Using Surface and Edges for 3D Modeling Operations in DesignModeler

Making use of existing geometry for 3D modeling operations in ANSYS DesignModeler can save you time and produce a cleaner model.  Perhaps you want to extent the geometry by extruding an existing face, or use an edge as the path in a sweep operation. If you’ve ever tried to pick a face then extrude it you may have been frustrated to find you can’t select a face as the base object. Continue reading