How Can You Get More From An Oil Pump?

Imagine you have an oil pump in your car that has its outlet blocked. The pump is trying to throw the oil out but since the outlet is blocked the pressure in the pump keeps increasing. The excessive pressure that develops in the pump can be catastrophic to its strength and therefore life. This is precisely what happens when you try to operate the pump under extreme cold conditions, when the viscosity of the lubricant increases so much that the pump almost behaves as if its outlet has been blocked.

pumpsThis is a very common design scenario for pump manufacturers. Estimation of what is called as “shut-off” pressure and its implications on the structural integrity of the pump are key concepts that every pump manufacturer should bear in mind while designing pumps. Interestingly, simulations today allow manufacturers to develop deep understanding of such phenomenon and help them to design pumps, that perhaps they could not have, with just physical testing and prototyping. Continue reading

Team Nemesis Preparations for BAJA SAE India 2014 – Guest Blog

image of Akshay Pandhare

GUEST BLOGGER: Akshay Pandhare is a team captain of Nemesis racing for BAJA SAE India 2014 event. He is in the final year of mechanical engineering at COEP, Pune.

Team Nemesis Racing is a division of COEP Motorsports that has, for the past eight years, participated in the SAE BAJA Competitions held at various national and international levels. We conceptualise, design and build our all-terrain vehicles (ATVs) which undergo rigorous tests and inspections during the competition which include endurance racing. We are the proud winners of BAJA India (Overall) and South Africa (Endurance & cost report) in 2013.

The important aspect we look for in designing all our vehicles is the major stresses and strains the components undergo under the rigorous racing conditions and how to counter them and optimise the design ensuring maximum strength and safety with minimum weight. This is made possible by ANSYS’ unmatched simulation environment and superior physics engine. Continue reading

Terrafugia: Developing a Flying Car – Engineering Challenges and Best Practices

Editor’s note: A special thank you to the Terrafugia Engineering Team for compiling today’s blog post.

From conceptual design to manufacturing, we use simulation tools such as ANSYS® Mechanical™ and ANSYS Composite Prep-Post™ to significantly reduce development time and costs. Our senior engineers, Mark Corriere and Nicholas Tucker, have been leading the analysis and simulation charge on the Terrafugia Transition® and have used this iterative process to increase confidence in the physical structure.

Image of Terrafugia Transition

Terrafugia Transition – example of a frontal load case analysis

This is a highly visible topic that we’ve found a lot of people are interested in learning more about, so we’ve teamed up with ANSYS for a webinar at 1pm ET, this Thursday, March 6th, to discuss the technical challenges and design process of developing the Terrafugia Transition®, the premier flying car. The Transition® addresses the limitations of typical general aviation aircraft by extending the multi-purpose flexibility of its driving capability. Continue reading

Reliable Turbomachinery Blade Development

Our Tech Tips for reliable turbomachinery blade development looks a little different this month because (unbeknownst to me) our IT department is moving some equipment this weekend, and well, I didn’t want you to miss out, so we’re cross-publishing this one on turbomachinery here on the blog!

Turbomachinery Blade Development with Aero-Mechanical Simulation

Engineers need advanced simulation tools to enable them to meet customer demands for more-efficient and reliable high-performance machines. Engineers must accurately predict aerodynamic performance across an increasingly wide range of speeds and operating conditions, and they also must guarantee reliability in the design. For example, they need to ensure that blade vibration will be damped across the operating range and that cyclic unsteady loading will not impact design life.  Continue reading

Advances in ANSYS Mechanical 15.0 – High Performance Computing

ANSYS 15.0 contains a number of amazing achievements in the area of high performance computing (HPC) for the Mechanical APDL product. The performance is up to 5 times faster than previous releases, especially at higher core counts, by means of improved domain decomposition algorithms.

In addition, new parallel functionality was added in this release. One of the most important new features was the subspace eigensolver for vibration analyses, which supports distributed memory parallel and can be several times faster than the widely used block Lanczos eigensolver. Continue reading

5 Favorite Features of ANSYS Mechanical APDL 15.0

Developers rarely have the luxury of pausing to look back. Still, it is a good and necessary exercise to take some time to assess the relevance of a particular release amid the hustle and bustle of new development, release activities, and planning.

PADT BlogFortunately, most ANSYS partners have a close relationship with the user base, and we can count on many of them to gauge customer reaction to a given release. Recently, I came across our colleague and channel partner Eric Miller’s blog on ANSYS Mechanical 15.0. Eric chose ten of what he considers to be the “coolest” features in both ANSYS Mechanical and ANSYS Mechanical APDL.

In his concluding thoughts, Eric wrote, “The hard part for me in writing this posting was picking the top 10.”  We agree! If Eric’s comments have heightened your curiosity, I have identified five great additional features of ANSYS Mechanical APDL R15 to complement his list. Continue reading

Parallel Part Meshing in ANSYS Mechanical: The Need for Speed

One of my personal “wishlist” items was that our ANSYS Mechanical software make better use of the full potential of my 12-core PC workstation, like our solvers do with HPC. With ANSYS 15.0, my wish has been granted — part meshing in ANSYS Mechanical is now parallel! By and large meshing occurs independently on each part, thus it is a perfect candidate for massive parallel speedups.

When the meshing team told me they were planning on supporting parallel part meshing, I was more than willing to throw my customer inspired models at it. First, I tried it out on a model near the 100 part mark and quite simply I was amazed. I actually didn’t believe the performance that I was witnessing so I tried more models — the speedups in ANSYS 15.0 over ANSYS 14.5 were often 10x faster and some more than 20x faster! Continue reading

Turbomachinery, Vibration, and High-Cycle Fatigue

stress in a bladed disk

Stress in a bladed disk

Turbomachinery — turbochargers, compressors, jet engines, gas turbines, pumps, etc.— are subjected to some of the harshest environments for an engineered product. High rotational velocities and extreme temperatures and pressures produce high static stresses. Couple on top of that the vibrations encountered due to the fluctuating and turbulent flow field, rotating turbomachinery components are primed for high-cycle fatigue (HCF) failures.

Traditionally, cyclic modal analyses are used to extract the vibrational modes and the appropriate modes from Campbell and interference diagram assessments are scaled based on past test data to arrive at estimates of the vibratory stresses for a fatigue analysis. Continue reading