Ryan Dark
Ryan has been in the GoEngineer technical support team since February 2008 where he most notably provides support for all FEA and CFD software offered by SOLIDWORKS. His most recent accolade is the title of Elite Application Engineer awarded by SOLIDWORKS Corp.

## Flow Simulation – How to Handle a Vortex Across a Pressure Boundary

April 19th, 2017 by Ryan Dark

### What is a “Vortex Across a Pressure Boundary?”

In Flow Simulation, a vortex is a region in the fluid domain which causes a swirl in a region where there is asymmetric drag in the flow field.  The vortex itself is an expected phenomenon which itself is not problematic.  When that vortex is allowed to generate across a theoretical boundary within a CFD analysis that can cause the results to deviate from reality in the immediate vicinity of the boundary or also cause the solver to fail to produce results at all.  For that reason, it is important to note where this is happening in an analysis and take steps to avoid it.

### How can this be fixed?

The vortex itself is generating because of the local solid geometry near the pressure boundary of a CFD setup.  If the flow through the boundary is not symmetric, a low-pressure region can generate in front of the boundary allowing fluid to pass the wrong direction through the boundary as intended.  The fix for this is to “build out” the model geometry.  What does this mean? The solid model needs to have more real life geometry added to the setup so the flow field can be allowed to have the vortex and then transition into a unidirectional flow.

An example of a vortex across a boundary would be directly from the first Flow Simulation tutorial in SOLIDWORKS.

(The tutorials can be found under ‘Help’, ‘SOLIDWORKS Simulation’, ‘Flow Simulation Online Tutorial’ once the Flow Simulation add-in is turned on).  The ball valve, as it is setup in the tutorial, has two lids that are positioned closely to the ball of the valve.  In situations where the ball valve is not set completely open the flow through the valve is forced to be asymmetric as it passes through the pressure outlet.

The asymmetric flow out the pressure boundary allows fluid to backflow through the theoretical pressure boundary and creates the vortex that is seen below. Read the rest of Flow Simulation – How to Handle a Vortex Across a Pressure Boundary

## GoEngineer Customer Builds Enclosures That Enable 3D structures to Light Up the Night

March 29th, 2017 by Mitch Bossart, Industry Writer for GoEngineer

Human beings seem helplessly attracted to moving pictures and light, the closest example being the smartphone in your pocket. But also think about television, movie theaters, and even concert light shows — all examples of our moth-like fascination with light.

### Painting with Light

“Video mapping is becoming the largest part of my business,” says Tim Burnham, president of Tempest, the world’s premier manufacturer of specialist outdoor enclosures for digital projectors and conventional and moving lighting instruments. Video mapping essentially “paints” a building with video and light, usually from multiple projectors at multiple angles.

Figure 1: Tempest products in action – twelve Cyclone enclosures along the Atlantic City Boardwalk survived Hurricane Sandy without a scratch.

Read the rest of GoEngineer Customer Builds Enclosures That Enable 3D structures to Light Up the Night

## Stratasys F123 Series Announced

February 22nd, 2017 by Tyler Reid

Stratasys recently announced a new lineup of three new FDM machines known as the F123 series. This new lineup of printers brings you new design, new components, new software and so much more. Learn how the Stratasys F123 Series makes the Rapid Prototyping process more efficient and productive for you and your team in this webinar:

## Top New Features of SOLIDWORKS Electrical 2017

January 31st, 2017 by John Lieber, Sr. App. Engineer

SOLIDWORKS Electrical 2017 is here and we are super excited about some of the new features and enhancements it provides.  Although SOLIDWORKS Electrical is still a relatively young product to SOLIDWORKS; it’s users have been actively putting it through its paces and making suggestions to make it even better. This year we not only see some great enhancements, we got some great new capabilities.

#### 1. 3D Layout – Use existing assembly

You can now use an existing SOLIDWORKS Assembly to insert your electrical components to route your wires, cables, and harnesses. They have also renamed the command, it’s still under the process tab but it’s now called “SOLIDWORKS Assembly”.  You can still have electrical create a new assembly or select an existing assembly from your local drive, network or Enterprise PDM.

#### 2. Add data file shortcuts

When adding documents to your projects, such as a PDF, you can now link to the document. This is awesome because it allows you to store your reference material where you traditionally keep it instead of making copies within the project.

#### 3. Replace attribute and renumbering documents

Both commands received huge improvements as well as new interfaces. Both make it easier to incorporate changes faster and more accurately.

## Top 6 GoEngineer Product Design Webinars of 2016

January 3rd, 2017 by Sandy Ortez

### Recorded Webinars – A Tool for Personal & Professional Development

It’s hard to believe 2016 has come and gone.  Were you successful in completing your 2016 resolutions?  I found personally, that setting obtainable goals worked best and were much more fulfilling in hindsight. Here are 3 rules I live by:

1. Commit to a Resolution that is obtainable – Start Small.
2. Tell everyone close to me for accountability purposes – Talk about it.
3. Don’t quit when steps aren’t achieved as quickly as intended – Never Give up!

So, now that we’ve outlined how to set a resolution and stick to it, let the learning begin! Below you will find a short list of Top GoEngineer webinars of 2016.

### Sit back, Grab a cup of coffee or tea, and hit play!

For this first video, you will learn about New and Enhanced Features of SOLIDWORKS 2017 according to Sean Stone, Applications Engineer.  Here Sean shares some of his favorites from this years’ launch events as well as some buried in the What’s New document.

Visuals are important to the design process, stories, social media and more. They are dominating Pinterest, that’s for sure.  In this webinar, you will learn tips and tricks to the Visualize Interface and ideas for new graphical content you can bring to your company.

## SOLIDWORKS 2017 Grouping Components in the Feature Tree

December 22nd, 2016 by Amee Meghani, Applications Engineer

### What is a Singularity?

A singularity is a function’s divergence into infinity. Simulation occasionally produces stress (or heat flux) singularities.

How do they occur? Mathematically, the solver uses matrices to represent the elastic field (displacements of the elements). When a highly localized load is applied, the gradients of the displacement vectors begin to diverge, causing the roots of the matrices to go to infinity. For a simplified explanation, see the stress equation below. Stress goes to infinity due to force applied in a very small area.

### Where do Singularities occur?

Singularities are usually seen at points, edges, or reentrant corners. Reentrant corners are interior corners, with angles pointing into the part. The high stress concentrations are usually seen near 90 degree corners, but can potentially occur for any angle less than 180 degrees.

### Why don’t they occur in real life?

Think of the common case of singularities created on interior corners. In software, that corner is perfectly sharp. In real life, there will always be a slight bend.  Also, the part may deform slightly, or “slip”, and allow the faces of the corner to slide against each other. The slight bend and additional friction allow for a converging stress.
“Adjust your legend’s color settings to grey out above the material’s yield point. This prevents singularities from overshadowing other important stress results!” – Joe Engineer, Know It All, GoEngineer

## 2016 Holiday Gift Guide for the Nerd You Love, Even if it’s Yourself.

December 8th, 2016 by Amee Meghani, Applications Engineer

It’s hard to shop for a gadget-y, tech-savvy person, but here’s a good gift guide for the nerd you love. In my family, I’m the nerd I love.

If you feel the urge to send me any of these items below, the address is 2033 Chennault Dr., Carrollton, TX 75006.

1.     Anoto’s Livescribe Smartpen, \$119.99

I write lists. On paper. With a pen.  Writing helps me remember, while typing with my thumbs on an itty bitty screen does not.  Then I struggle to coexist between a paper and paperless world. But Livescribe solves that. It’s a Smartpen that houses an infrared camera, ARM processor, Bluetooth Smart chipset, flash memory and lithium ion battery all work together to bring your notes to life on your tablet or smartphone. Android and iOS friendly.

November 29th, 2016 by Amee Meghani, Applications Engineer

Let’s talk about your SOLIDWORKS network license and debunk those myths with facts. Which one of these 5 are you guilty of believing?

## Custom Motorcycle Windscreen Brackets with SOLIDWORKS & Stratasys 3D Print Technology

November 1st, 2016 by Paul Nishihira

### Motorcycle Riding – 2010 KTM SMT

For me, riding my motorcycle is having the freedom of the open road and traveling with the wind in my hair!  Sounds great, right?  Well, after any extended period of riding in the weather elements; physical and mental fatigue takes over, leaving the operation of a motorcycle quite dangerous.

On my quest to create comfort and extend my riding to a long haul, I decided to improve the stock windshield (or windscreen) of my KTM SM-T. This is where aftermarket parts, SOLIDWORKS and 3D printing technology takes over.

### Motorcycle Windscreen: Stock vs Touring

Take a look at the stock windscreen below. It looks ergonomically ‘sporty’ but doesn’t provide much protection from the weather elements.

In comparison, you will see a touring windscreen below. This version is significantly taller but still does not provide the necessary protection from the weather elements.

## GoEngineer Hosts SOLIDWORKS 2017 Launch Events

September 26th, 2016 by Tandy Banks

## It’s That Time of Year – SOLIDWORKS 2017 is here!

SOLIDWORKS 2017 Launch season is here and GoEngineer is hosting a series of events near you. Come and see what makes great design happen with the new SOLIDWORKS 2017 release throughout October and November.

SOLIDWORKS 2017 has more core power and performance, with enhanced capabilities for emerging technologies. It’s never been easier to design and create with SOLIDWORKS. Areas of focus to help improve your workflow are:

• DESIGN – More core power and performance to get your job done faster
• VALIDATE – Greater design ideas that lead to breakthrough innovations
• COLLABORATE – Unlock any 3D model to work with SOLIDWORKS
• BUILD & MANAGE – Data integration from concept to manufacturing to drive business needs

Whether you’re a fresh startup or experienced global company, SOLIDWORKS 2017 provides an integrated development ecosystem that helps you turn your ideas into finished products faster and with higher quality.  Come and learn more at one of our live events – Reserve your seat today!

## SOLIDWORKS World 2017 is coming to Los Angeles

We are just a few months away from the premier 3D design event of the year, SOLIDWORKS World 2017!  Taking place in Los Angeles, CA from February 5-8, 2017, this event is where like-minded professionals come together to share their passion for SOLIDWORKS.  Here are a few reasons why you should attend:

• Find answers to your everyday design challenges & learn best practices
• Get a preview of the future of SOLIDWORKS
• Explore new technologies & test drive the latest tools
• Collaborate with similar companies & make new friends!

Early Bird Savings:  Register now to take full advantage of what SOLIDWORKS World has to offer while saving money. Now through November 4th, all full conference registrations will receive \$200 off.  Additional details visit: SOLIDWORKS World 2017 .