The peristaltic pump has become popular across various applications since being patented in the U.S. more than 120 years ago, and technological advances continue to make it relevant. The pump alternates compression and relaxation in its hoses and tubes, drawing fluid in and out. Our throat and intestines are actually good examples of peristaltic pumps.
I recently studied peristaltic pumps with computer analysis to see if I could improve the design through simulation. Where was the starting point? As a multiphysics program, ANSYS’ software suite provided a complete solution to the simulation of a peristaltic pump and I used software ranging from ANSYS Mechanical and ANSYS Fluent to ANSYS Explicit Dynamics Each tool has its unique capabilities and solved the problem at hand from different perspectives. Continue reading →
From a structural reliability point of view, it is very important to understand and accurately characterize the material behavior when designing or analyzing an engineering application.
In this respect, ANSYS Mechanical software provides a vast library of material models that can help users simulate various kinds of behaviors such as elasticity, plasticity, creep and hyperelasticity, just to name a few.
Although these models can be used to investigate the mechanical response of a large number of different materials such as metals, rubbers, biological tissues and special alloys, users may wish to incorporate their own material laws into ANSYS. Continue reading →
Some time ago, I wrote a couple of posts describing the performance of ANSYS Mechanical APDL on several different tablet computers. Previously, I had studied two separate tablets: one from Fujitsu, which was more of a shrunken laptop with an Intel® Core i5 processor and a second from Dell, which had an Intel® Atom™ processor and was more in line with the look and feel of an iPad. The Fujitsu tablet was clearly faster, but bulkier and pricier. The Dell tablet was lighter, smaller, cheaper, and also less powerful. Continue reading →
The pressure is on to reduce fuel burn for gas turbines of all types. The need is particularly acute for aircraft engines, in that fuel is a large component of operating costs of an airline, so much so that even the volatility in its price can mean the difference between profit and loss. So when airlines demand more fuel efficient aircraft, much of that requirement is passed along to the engine manufacturers. While reducing gas turbine fuel burn is a primary driver, carbon emissions are related, so reducing the fuel burn “kills two birds with one stone”. Continue reading →
Vapor Volume Fraction in EGR Cooler Due to Boiling
Heat exchangers are among the most common process equipment. They come in different sizes (e.g. cold plate within your mobile phone vs a waste heat recovery system in a plant), shapes (shell and tube, tube in tube, plate and frame, for example) and types (recuperative and regenerative).
Although many heat exchangers have been thoroughly studied, analyzed and even optimized, the need to improve heat exchanger performance, reduce their capital and running costs, and increase their durability will never end. Continue reading →
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 →
Diffusion is the process by which subject is transported from one part of a system to another as a result of random molecular motions, which is analogues to transfer of heat by conduction. Examples of diffusion are, but not limited to, spreading of odors and smoke (in gas), dissolution of colored dye in water (in liquid), formation of alloys, solid-state reactions, formation of new grains in cold-worked metal, improving surface wear by carburizing, gas purification, impurity doping of silicon wafers for integrated circuits. Continue reading →
Recently my colleague, Simon Pereira, published his blog on the use of parameters with PTC’s Creo CAD system. I don’t think we can stress enough the importance of the connection between your CAD system and your simulation tool, be it FEA, CFD or electronics.
All simulations start from a geometry. The geometry can be a very early version of a given design or a manufacturing-ready version of it. You then need to import it into your simulation tool to analyze it. Continue reading →