November 2008 Issue 7 L INKED I N CFD A networking forum for CFD professionals Inside This IssueNewsletter Issues Newsletter Issues Becoming More Practical 2 1 Share Your Thoughts 2Your Opinion: My request for group’s opinion on continuing Improving solar panel 3the monthly newsletter went out to 650 members and I heard back from 35 members (little more than 5%). Interestingly, only two members did not see any value for the newsletter. That is, the majority of respondents requested interesting comment from John Chawner of Pointwise. He that newsletter to be continued in some shape or form. wrote: It would be interesting to know how you see the Unfortunately, this might be the last newsletter and I might group differentiating itself form other CFD forums such as have to disappoint these folks. Honestly, emailing the CFD-‐Online.com and CFDReview.com. My thought is that the newsletter or the link to a newsletter is a chore. Currently, I best way this group can help our members is to provide a use Gmail to email the entire group and Gmail does not allow forum for networking and this networking could certainly mass email to more than 500 addresses at one time, with or include technical as well as professional. What distinguishes without attachment. Also, they limit the number of mass this group from the other forums is that you can reach the emails sent per day. We currently have 706 members and we entire group of CFD professionals all at once as well as reach are still growing. Another problem is our membership is for them individually. What I hope we can develop is a constantly changing. Therefore, I have to continue making database that we can easily search to find the person or skill changes to the distribution list by exporting from LinkedIn we are looking for that already resides in our group. The and importing to Gmail. Finally, I am getting requests from expertise is there and the information is there as well. We some members to be taken of the Newsletter email just need to put it together. I believe soon we can distribution. accomplish that. LinkedIn is constantly evolving and more tools are being provided to groups. My aim is to use all the Discontinuation of Newsletter: I believe majority of our available tools and keep you updated.members would like to see an active group and I don’t believe that necessarily means through newsletter. I started the newsletter because in the past there were no means to communicate with the entire group. Now LinkedIn allows group members to post a discussion or an article for the entire group to see. Therefore, members can bypass the newsletter or me and make an announcement to entire group on their own. Members will however need to set your email notification appropriately if they want to know about Joining Usthese postings. To do that: On LinkedIn, go to group page; click on tab "setting,” and then in "contact settings" section, check Digest Email. Please encourage your CFD friends or colleagues to join our Improving the Group: The response on my questions LinkedIn CFD group. Please note that LinkedIn membership regarding the networking benefits and suggestion on is required for joining. To join, applicants should first sign in improving the group were fairly sparse. Several respondents on LinkedIn and then do a search in LinkedIn using stated that they have made some connections in the group, Keywords: CFD in Category: Professional Group. Our group but no drastic networking benefit was reported yet. I hope should be the first on the list. Look for our logo. this changes as we learn to use this great tool. Among the responses on how to improve the group, I got an
Becoming More Practical At University of Cincinnati the Theoretical Becomes Practical -‐ The University of Cincinnati has participated in the Pointwise Teaching Partnership for several years and uses Gridgen in many of its graduate and undergraduate courses in the Department of Aerospace Engineering and the Department of Mechanical, Industrial, and Nuclear Engineering. The University of Cincinnati, College of Engineering is known for originating the concept of cooperative education wherein students get practical Gridgen’s floating boundary conditions are used to quickly industrial experience while completing their studies. Even in improve grid quality on multiple block structured grids. the classroom, students receive hands-‐on experience with the engineering tools, like Gridgen, they will use after they graduate and begin their professional careers. Professor Paul Orkwis coordinates Gridgen’s usage at the University of Cincinnati. He notes, “Gridgen provides an effective means of tying together theory and practice of mesh construction in a single package for students to explore both structured, unstructured, and hybrid mesh generation.” In his numerical grid generation course, Professor Orkwis’ students quickly become proficient using Gridgen as he Structured and unstructured grids are combined to resolve notes, “After only a single lecture, students had learned the both the boundary layer and vortical flow structures around basics and were able to generate structured, unstructured, this air vehicle. and hybrid meshes on simple geometries. Before long, students were generating meshes pertaining to their own interest and research topics.” Gridgen has been used for a variety of student research projects from the study of blood flow in arterial grafts to turbine blades and advanced aircraft projects. A good example of the types of structured grids being generated by University of Cincinnati students is the mesh Share Your Thoughtsfor a turbine blade generated by graduate student Marshall Galbraith shown in the figure below. Floating boundary conditions in Gridgen’s elliptic partial differential equation based smoothing techniques were used to improve grid You now have the tool to share your ideas, requests, opinions, quality by allowing domain boundaries to move. announcements, and news to the entire LinkedIn CFD group. Students have also used Gridgen for hybrid grids. The figure You can either post a discussion or an article. You can submit a below shows a hybrid grid comprising hexahedral, pyramidal discussion topic or a news article at “overview” page of our and tetrahedral cells for an Uninhabited Air Vehicle study. In group. To get notified of these posting: this case, the grid needs to resolve the surface boundary On LinkedIn, go to group page; click on tab "setting,” and then layer, but must also resolve a strong vortex that comes off in "contact settings" section, check Digest Email. the wing-‐body junction. The geometry is such that it makes the most sense to have unstructured grids away from the surface but a structured grid wrapped around the surface itself to resolve the boundary layer. This was accomplished in Gridgen without significant difficulty. Using Gridgen in the classroom and in research projects gives students experience with the types of analysis tools they will be using once they are in industry. At the University of Cincinnati it is just a continuation of their tradition of providing the highest level of both theoretical and practical education.
Improving PhotovoltaicSolar Panel PerformanceSchueco, one of the leading producers of photovoltaic panels, “Examining the flow of air under the photovoltaic panels used Flomerics’ FloVENT computational fluid dynamics (CFD) showed that the size of the passageway was constricting software to redesign its products to improve their thermal the flow of air. We increased the depth of the profile that performance so that 15% to 20% more panels can be used in a supports the photovoltaic panels to increase the distance given space. Today’s photovoltaic panels present a major between the panels and the roof. Re-‐running the thermal design challenge since every degree Centigrade of simulation demonstrated that this increased the airflow temperature rise reduces the power produced by 0.5%. “The and reduced the temperature of the photovoltaic panels. CFD results helped us understand exactly how the panels were Through these studies, we optimized the design of the solar being heated and guided us as we made major improvements energy systems and also gained an understanding of how to the design,” said Hamid Batoul, Technical Director of Solar temperature is affected by different arrangements of Department, Schueco International, Paris, France. “As the first panels and ambient conditions.” in our industry to perform CFD simulation, we believe that we are now able to provide our customers with substantially higher power output than an equivalent competitive design.” Schueco provides complete solar energy systems including all components needed to produce energy from the sun including panels, collectors, tanks, mounting system, control units and monitoring electronics. Sunlight hits the photovoltaic panels and generates direct current. The UK government sponsored Energy Saving Trust estimates that microgeneration could reduce the UK’s carbon emissions by 15% compared with the present mix of energy generation. The Rocky Mountain Institute in Snowmass, Colorado recently released a study that showed that output of small scale power sources will soon outstrip the world’s nuclear power industry. For more information about FloVENT, visit www.flovent.com. Schueco was the first company in the solar energy business to recognize that substantial improvements in photovoltaic panel performance could be achieved by optimizing thermal design. “I previously worked for several companies making telecommunications equipment and used thermal simulation to solve thermal challenges,” Batoul said. “I found that Flomerics’ FloTHERM CFD software was the most powerful tool available in that space. Performing thermal simulation of solar energy systems requires different software because of the need to model building materials that play a role in thermal performance. Flomerics offers FloVENT CFD software designing for addressing heating, ventilation and cooling problems in buildings. We tried FloVENT and found it met all our requirements such as modeling the thermal characteristics of glass and simulating the effects of radiation on the panels.” Batoul uses FloVENT to model complete solar systems. FloVENT simulates the absorption and reflection of solar energy by the panels, the transfer of heat to aluminum profiles and the surrounding air, etc. “The CFD results helped us understand exactly how the panels were being heated and guided us as we made major improvements to their design,” Batoul said.
LinkedIn CFD firstname.lastname@example.org Group Manager Kamran Fouladi email@example.com Phone: 610-291-6642 E-Mail: CFDlinked@gmail.comPast issuesPast issues of this newsletter can be accessed at: http://www.infomec.cc/news.htm