To read the full article visit the article “The inside track on simulation software” webpage.

]]>To read the full article visit the article “The inside track on simulation software” webpage.

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*Ed Ethridge a senior materials scientist in the Materials & Processes Laboratory at the NASA Marshall Space Flight Center in Huntsville, AL showcasing the water extraction process.*

The real world is inherently multiphysics. Electromagnetics, in particular, does not exist in isolation. Rather, other physical effects, like heat transfer and mechanical forces, can make a big impact on the performance of electromagnetic devices. For this reason, R&D teams are now adopting tools that let them innovate beyond the limited scope of traditional EM-only simulation. By considering all relevant physical effects in your designs, you can create computer models that give you the accuracy necessary to gain the competitive edge. This webinar is meant for anyone interested in simulation of RF and microwave heating in antennas, circuit boards, living tissue, or any device that has a combination of lossy dielectric and metallic domains.

Attendance is free.

To access the event please register here or if you have previously registered for any event log in with your email address.

]]>To view the full size video in a Pop-out window link, click here.

]]>New York, NY – A new invention could help millions of manual wheelchair users increase their mobility while decreasing upper body, repetitive stress injuries. Many who suffer from muscle pain, torn rotator cuffs, joint degeneration, and carpal tunnel syndrome due to muscle overuse will benefit from the Rowheel Wheelchair Propulsion System. This innovative design uses a pulling/rowing motion as opposed to the standard pushing motion.

Developed by Salim Nasser of Merritt Island, FL, the Rowheel System design involves adapting a planetary gear system at the center of the wheel, which reverses the pulling motion of the user into a forward motion of the chair. The unique change from pushing to pulling along with the mechanical advantage created by the use of the gear system provides an overall increase in user endurance and range.

Click here to read the complete press release.

]]>New York, NY – The eighth “Create the Future” Design Contest **(www.createthefuture2010.com) **sponsored by PTC, COMSOL and Tech Briefs Media Group opens today and entries will be accepted through June 30, 2010. The contest is an opportunity to receive global recognition and a cash prize of $20,000 for a breakthrough product idea.

Past contests have generated over 1,000 design ideas annually from engineers, educators and students in more than 50 countries. Previous grand prize winning entries include a device that makes CPR easy and safe for anyone to perform, a fuel-saving motor/pump for cars and trucks, a low-cost in-vehicle emergency warning system, and a new type of energy-efficient lighting.

]]>`tresca_smsld`

and `mises_smsld`

if you are modeling in 3D with the Structural Mechanics Module). Now all you need to do is enter `sqrt(0.5*(tresca_smld^2+mises_smld^2))`

in any of the Expression fields and click OK to see your new stress distribution.

You probably didn’t think of it, but in the expression I just mentioned, `sqrt`

, `^`

, and even `+`

are all examples of operators. COMSOL offers a whole range of useful ones, not all equally obvious. Did you for instance know that the letter `d`

will differentiate any variable or expression with respect to time or space? `d(c,z)`

gives the derivative of a concentration `c`

with respect to the `z`

-coordinate. `d(sqrt(0.5*(tresca_smld^2+mises_smld^2)),t)`

is the time-derivative of your stress. If you have created your own subdomain expression `my_stress`

containing your stress definition, `d(my_stress,t)`

gives the same results.

The `at`

operator lets you access the solution at any time in postprocessing. This is handy if you want to see changes over a time interval. Plotting the expression `at(20,p)-at(10,p)`

overrides the *Solution at time* setting and shows you the pressure increase between 10 and 20 seconds. The `with`

operator lets you postprocess more than one parametric or eigensolution in a similar fashion.

Another handy pair of operators is `up`

and `down`

. They live on boundaries and help you evaluate anything with discontinuities. Consider for example a temperature gradient on a boundary between two subdomains with different conductivities. `gradT_ht`

will silently evaluate this gradient on both sides of the boundary and give you the average. With `up(gradT_ht)`

and `down(gradT_ht)`

however, you can decide which side you are interested in.

If you work with electromagnetics, you might have plotted the magnetic field in an eigenmode analysis only to find that it appears to be identically zero. Chances are it is non-zero but perfectly imaginary due to its 90-degree phase difference with a real-valued electric field. Use the `imag`

operator to show its imaginary part, `abs`

to plot the norm, or `arg`

to see the phase angle. Note that the default plot for complex fields shows the real part.

This is just the tip of the iceberg. You can find the complete list of mathematical and other operators in the COMSOL Multiphysics Quick Start and Quick Reference.

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