Symscape blogs
http://www.symscape.com/blog
Save money and time performing fluid flow and heat transfer simulations with Caedium - an affordable priced, easy-to-use, all-in-one Computational Fluid Dynamics (CFD) software system.enExternal Aerodynamics with CFD
http://www.symscape.com/blog/external-aerodynamics-with-cfd
<p><a href="http://www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a> sees broad use in many applications across a diverse range of industries. No more so is this true than in the applications you'll see for CFD in external aerodynamics analysis.</p>
<p><span class="inline inline-center"><img src="http://www.symscape.com/files/pictures/misc/wind-city.png" alt="CFD Simulation of a City" width="600" height="458" /><span class="caption"><strong>CFD Simulation of a City</strong></span>Air Velocity Vectors</span></p>
<p><a href="http://www.symscape.com/blog/external-aerodynamics-with-cfd" target="_blank">read more</a></p>http://www.symscape.com/blog/external-aerodynamics-with-cfd#commentsWed, 22 Oct 2014 19:55:02 +0000Richard Smith1538 at http://www.symscape.comA Case for Renaming the Navier-Stokes Equations
http://www.symscape.com/blog/case-for-renaming-the-navier-stokes-equations
<p>You probably know that the <a href="http://www.symscape.com/blog/navier_stokes_equations">Navier-Stokes (NS) equations</a> are named after <a href="http://en.wikipedia.org/wiki/Claude-Louis_Navier">Claude-Louis Navier</a> and <a href="http://en.wikipedia.org/wiki/Sir_George_Stokes,_1st_Baronet">George Gabriel Stokes</a>. Navier come up with the first original derivation based on discrete molecular interactions (discrete approach) and Stokes originated the assumption of a continuum directly using viscosity that is the widely referenced approach still taught today. However, between these two approaches there were other derivations, a<em> continuum of sorts</em>, attributed to other luminaries of 19th Century science.</p>
<p><span class="inline inline-center"><img alt="Navier and Stokes" src="http://www.symscape.com/files/pictures/misc/navier-stokes-portraits.jpg" width="464" height="307" /><span class="caption"><strong>Navier (left) and Stokes</strong></span>Room for more?</span></p>
<p><a href="http://www.symscape.com/blog/case-for-renaming-the-navier-stokes-equations" target="_blank">read more</a></p>http://www.symscape.com/blog/case-for-renaming-the-navier-stokes-equations#commentsTue, 14 Oct 2014 13:05:00 +0000Richard Smith1532 at http://www.symscape.comLudwig Prandtl: Real Fluids Explained
http://www.symscape.com/blog/ludwig-prandtl-real-fluids-explained
<p>Prior to <a href="http://en.wikipedia.org/wiki/Ludwig_Prandtl">Ludwig Prandtl</a> (1875 - 1953), analytic analysis of fluids with an early form of <a href="http://www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a>, confined to paper and pencil, assumed <em>ideal</em> inviscid potential flow. However, this approach was less than <em>ideal</em> at predicting drag (<a href="http://en.wikipedia.org/wiki/D'Alembert's_paradox">d'Alembert's paradox</a>) and airfoil stall, which was a pressing problem for engineers at the dawn of powered heavier-than-air flight. Prandtl developed practical theories for real fluids that found favor with aircraft designers. Also, like <a href="http://www.symscape.com/blog/osborne-reynolds-a-giant-in-fluid-dynamics">Osborne Reynolds</a> before him, Prandtl had a <a href="http://www.symscape.com/dimensionless-numbers">non-dimensional number</a>, the <a href="http://en.wikipedia.org/wiki/Prandtl_number">Prandtl Number</a>, named after him.</p>
<p><span class="inline inline-center"><iframe width="560" height="315" src="//www.youtube.com/embed/cv952Nhc_vs?list=PL0jAiXLfdUJBAoYmevhgcao62CBX9fIlF" frameborder="0" allowfullscreen></iframe><span class="caption"><strong>The Life and Times of Ludwig Prandtl</strong></span>Told by <a href="http://en.wikipedia.org/wiki/Eberhard_Bodenschatz">Eberhard Bodenschatz</a></span></p>
<p><a href="http://www.symscape.com/blog/ludwig-prandtl-real-fluids-explained" target="_blank">read more</a></p>http://www.symscape.com/blog/ludwig-prandtl-real-fluids-explained#commentsWed, 08 Oct 2014 21:06:28 +0000Richard Smith1531 at http://www.symscape.comOsborne Reynolds: A Giant in Fluid Dynamics
http://www.symscape.com/blog/osborne-reynolds-a-giant-in-fluid-dynamics
<p>If you have performed simulations with industrial <a href="http://www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a> and thereby solved the <a href="http://www.symscape.com/reynolds-averaged-navier-stokes-equations">Reynolds-Averaged Navier-Stokes (RANS) equations</a>, or if you have compared scaled fluid dynamic experiments with their full size counterparts using the <a href="http://www.symscape.com/reynolds-number">Reynolds Number</a>, then you have benefited from the groundbreaking work of <a href="http://en.wikipedia.org/wiki/Osborne_Reynolds">Osborne Reynolds</a> (1842 - 1912).</p>
<p><span class="inline inline-center"><iframe width="560" height="315" src="//www.youtube.com/embed/Wa-RSKv7SRU?list=PL0jAiXLfdUJBAoYmevhgcao62CBX9fIlF" frameborder="0" allowfullscreen></iframe><span class="caption"><strong>The Life and Times of Osborne Reynolds</strong></span>Told by <a href="http://en.wikipedia.org/wiki/Brian_Launder">Brian Launder</a> (himself a giant in turbulence modeling)</span></p>
<p><a href="http://www.symscape.com/blog/osborne-reynolds-a-giant-in-fluid-dynamics" target="_blank">read more</a></p>http://www.symscape.com/blog/osborne-reynolds-a-giant-in-fluid-dynamics#commentsThu, 02 Oct 2014 21:21:29 +0000Richard Smith1530 at http://www.symscape.comSliver Treatment Strategies for CFD
http://www.symscape.com/blog/sliver-treatment-strategies-for-cfd
<p>Extremely thin, high-aspect-ratio geometry faces (also known as slivers) can cause problems for meshing and adversely affect <a href="//www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a> simulation stability. Learn some strategies to identify and deal with slivers to maximize your CFD productivity.</p>
<p><span class="inline inline-center"><img src="//www.symscape.com/files/pictures/sliver/sliver-surface-mesh.png" alt="Sliver Surface" width="500" height="277" /><span class="caption"><strong>Sliver Surface</strong></span>Produces poor surface mesh elements (blue)</span></p>
<p><a href="http://www.symscape.com/blog/sliver-treatment-strategies-for-cfd" target="_blank">read more</a></p>http://www.symscape.com/blog/sliver-treatment-strategies-for-cfd#commentsThu, 11 Sep 2014 12:39:05 +0000Richard Smith1525 at http://www.symscape.comHow to Fix Small Acute Angles for CFD
http://www.symscape.com/blog/how-to-fix-small-acute-angles-for-cfd
<p>Small acute angles in your geometry, such as those found where a tangential surface meets a cylindrical surface, can lead to poor results from your <a href="http://www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a> simulation. Keep reading to learn how to identify and remedy acute angles.</p>
<p><span class="inline inline-center"><img src="//www.symscape.com/files/pictures/tangent/tangent-mesh.png" alt="Small Acute Angled Geometry Feature" width="500" height="300" /><span class="caption"><strong>Small Acute Angled Geometry Feature</strong></span>Produces poor mesh elements</span></p>
<p><a href="http://www.symscape.com/blog/how-to-fix-small-acute-angles-for-cfd" target="_blank">read more</a></p>http://www.symscape.com/blog/how-to-fix-small-acute-angles-for-cfd#commentsThu, 28 Aug 2014 13:38:17 +0000Richard Smith1523 at http://www.symscape.comSmall Feature Removal for CFD
http://www.symscape.com/blog/small-feature-removal-for-cfd
<p>In preparing geometry for a <a href="//www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a> simulation you will sometimes find small geometry features (edges and faces) that are irrelevant for your simulation. To resolve a small irrelevant feature would require a large number of small mesh cells that would be a waste of precious computing resources. Keep reading to find out how to detect and remove such features.</p>
<p><span class="inline inline-center"><img src="//www.symscape.com/files/pictures/small-feature-removal/small-feature-mesh.png" alt="Small Feature Causing Unnecessary Mesh Cluster" width="499" height="304" /><span class="caption"><strong>Small Feature Causing Unnecessary Mesh Cluster</strong></span></span></p>
<p><a href="http://www.symscape.com/blog/small-feature-removal-for-cfd" target="_blank">read more</a></p>http://www.symscape.com/blog/small-feature-removal-for-cfd#commentsTue, 19 Aug 2014 15:24:51 +0000Richard Smith1522 at http://www.symscape.comFluid Visualization in Nature
http://www.symscape.com/blog/fluid-visualization-in-nature
<p>On the rare occasions that CFD-ers unhitch from their Matrix and venture outdoors, it is only to see that nature is copying the <a href="http://www.symscape.com/blog/colormaps-vectors-streamlines">visualization techniques</a> we take for granted in <a href="http://www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a>.</p>
<p><span class="inline inline-center"><img alt="Flowing Stream Visualization Via Silt" src="https://lh3.googleusercontent.com/-At610qpvMhE/U-URaxaObLI/AAAAAAAACRE/kPloDakzTSs/s400/IMG_20140328_132103.jpg" width="400" height="225" /><span class="caption"><strong>Flowing Stream Visualization Via Silt</strong></span></span></p>
<p><a href="http://www.symscape.com/blog/fluid-visualization-in-nature" target="_blank">read more</a></p>http://www.symscape.com/blog/fluid-visualization-in-nature#commentsWed, 13 Aug 2014 13:36:31 +0000Richard Smith1516 at http://www.symscape.comDesign is Compromise
http://www.symscape.com/blog/design-is-compromise
<p>Rare is the occasion when you can design a new widget without constraints, in fact I'd argue that it's not only rare but it's never. Engineering design is all about compromise. Take a Formula 1 car as an example, its success on the race track is overwhelmingly governed by the efficiency of its aerodynamics - yet even though it's so important the <a href="http://www.symscape.com/blog/f1_aero">external aerodynamics for F1 cars</a> is an exercise in compromise. Compromise to satisfy regulations, which are in place to actually slow cars down for safety's sake. Compromise to ensure that the wheels are supported correctly relative to the road. Compromise to ensure that the engine gets enough inlet air, cooling air, and a path to eject exhaust. Compromise in terms of the driver's safety structure. Compromise after compromise. No one element of a design can be optimized without considering the effect on the overall design.</p>
<p><span class="inline inline-center"><a href="/node/308"><img src="http://www.symscape.com/files/images/hondaf1_2007_RA107.img_assist_custom-320x206.jpg" alt="F1 is a Compromise: 2007 Honda F1 Car" title="F1 is a Compromise: 2007 Honda F1 Car" class="image image-img_assist_custom-320x206 " width="319" height="206" /></a><span class="caption"><strong>F1 is a Compromise: </strong>2007 Honda F1 Car</span></span></p>
<div class="image-clear"></div><p><a href="http://www.symscape.com/blog/design-is-compromise" target="_blank">read more</a></p>http://www.symscape.com/blog/design-is-compromise#commentsMon, 04 Aug 2014 19:07:16 +0000Richard Smith1515 at http://www.symscape.comCFD Is Not Enough
http://www.symscape.com/blog/cfd-is-not-enough
<p>Although most <a href="http://www.symscape.com/computational-fluid-dynamics">Computational Fluid Dynamics (CFD)</a> software vendors would have you believe otherwise, a CFD tool alone does not a successful product make. Consider that Computer Aided Engineering (CAE) tools, such as CFD, are widely available yet some engineering organizations succeed and others fail. An excellent example is Formula 1, where all the teams use the latest state-of-the-art CFD tools, but some teams routinely win while others struggle. Clearly the governing factor is not the CFD tool they are using. The difference is the overall design and development process that encompasses CFD and, in no small part, the ingenuity of the engineers driving the process.</p>
<p><span class="inline inline-center"><a href="/node/946"><img src="http://www.symscape.com/files/images/refined-f1-streamlines.img_assist_custom-400x300.png" alt="CFD Simulation of an Open Wheel Racecar" title="CFD Simulation of an Open Wheel Racecar" class="image image-img_assist_custom-400x300 " width="400" height="300" /></a><span class="caption"><strong>CFD Simulation of an Open Wheel Racecar</strong></span></span></p>
<div class="image-clear"></div><p><a href="http://www.symscape.com/blog/cfd-is-not-enough" target="_blank">read more</a></p>http://www.symscape.com/blog/cfd-is-not-enough#commentsThu, 31 Jul 2014 18:23:42 +0000Richard Smith1513 at http://www.symscape.com