# Step-by-Step Tutorial: Homework of Session 2 **URL:** \ **Category:** F1 Workshop\ **Created:** [March 28, 2016, 10:00pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204 "2016-03-28T22:00:00Z")\ **Posts on this page:** 20\ **Page:** 2
**Author:** ![adonninelli](https://www.simscale.com/forum/letter_avatar/adonninelli/32/5_5575768a8748004e209b776fc1b2916d.png) [@adonninelli](https://www.simscale.com/forum/u/adonninelli)\ **Post date:** [March 30, 2016, 11:24pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/21 "2016-03-30T23:24:43Z")
Thanks for the answers man šŸ‘, yes of course i know about the increasing of computational time and memory usage due to number of elements increase. About the values of forces i see that there is roughly a difference in a range of 2% to 6% in the results final value (considering only the pressure forces and moment) between the two simulations. ---
**Author:** ![jramon\_mesa](https://www.simscale.com/forum/letter_avatar/jramon_mesa/32/5_5575768a8748004e209b776fc1b2916d.png) [@jramon\_mesa](https://www.simscale.com/forum/u/jramon_mesa)\ **Post date:** [March 31, 2016, 12:37am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/22 "2016-03-31T00:37:46Z")
Hi I got for the F1 aerodynamics Workshop Homework 2 a Mesh Error for the Rear Wing geometry (the one with loures). The Rear Wing \_2 geometry (withouth loures) meshed without problems These are the Error messages in my Mesh Operation Event Log: The tesselated surface is not closed. There could be a problem with the CAD geometry (such as self-intersections). Please inspect your geometry. Trying to proceed anyway. Illegal triangles were found after surface tesselation. There could be a problem with the CAD geometry. Trying to proceed anyway. Mesh quality check failed. The mesh is not OK. This is the projectā€™s link > **[SimScale Login](https://www.simscale.com/workbench?publiclink=fcde0f5c-35ad-496a-963d-2e8045af1639)** > > Log in to your SimScale account. SimScale makes high-fidelity engineering simulation technically and economically accessible. At any scale. In the cloud. Please advice Thanks for your help Regards Jorge ---
**Author:** ![ggiraldo](https://www.simscale.com/forum/user_avatar/www.simscale.com/ggiraldo/32/5226_2.png) [@ggiraldo](https://www.simscale.com/forum/u/ggiraldo)\ **Post date:** [March 31, 2016, 12:58am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/23 "2016-03-31T00:58:31Z")
Interesting, the variations seem to be low (2-6%), but I think this has to be judged depending on the purpose of the simulation. If for example you are using this to validate design changes, and it shows an advantage of 5% in downforce (I think this is a lot), how do you know it doesnā€™t come from the mesh? ---
**Author:** ![aedwards](https://www.simscale.com/forum/letter_avatar/aedwards/32/5_5575768a8748004e209b776fc1b2916d.png) [@aedwards](https://www.simscale.com/forum/u/aedwards)\ **Post date:** [March 31, 2016, 2:04am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/24 "2016-03-31T02:04:53Z")
That sounds like exactly the same problem I had. See earlier response that it is ok to use the mesh as is for processing ---
**Author:** ![jramon\_mesa](https://www.simscale.com/forum/letter_avatar/jramon_mesa/32/5_5575768a8748004e209b776fc1b2916d.png) [@jramon\_mesa](https://www.simscale.com/forum/u/jramon_mesa)\ **Post date:** [March 31, 2016, 2:23am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/25 "2016-03-31T02:23:51Z")
Ok thanks for the help . i just wanted to confirm ---
**Author:** ![FernandoAlmeida](https://www.simscale.com/forum/letter_avatar/fernandoalmeida/32/5_5575768a8748004e209b776fc1b2916d.png) [@FernandoAlmeida](https://www.simscale.com/forum/u/FernandoAlmeida)\ **Post date:** [March 31, 2016, 3:52am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/26 "2016-03-31T03:52:27Z")
For the simulation without the louvres, do we have to upload another CAD? ---
**Author:** ![l\_trefiletti](https://www.simscale.com/forum/letter_avatar/l_trefiletti/32/5_5575768a8748004e209b776fc1b2916d.png) [@l\_trefiletti](https://www.simscale.com/forum/u/l_trefiletti)\ **Post date:** [March 31, 2016, 4:03am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/27 "2016-03-31T04:03:32Z")
Itā€™s in the project. its name is Rear\_Wing\_2 ---
**Author:** ![aceci](https://www.simscale.com/forum/letter_avatar/aceci/32/5_5575768a8748004e209b776fc1b2916d.png) [@aceci](https://www.simscale.com/forum/u/aceci)\ **Post date:** [March 31, 2016, 4:57am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/28 "2016-03-31T04:57:23Z")
Hi, in the following link you will find the results of my homework 2 with some images and the downloaded cases for 80 m/s, both meshes. [https://www.dropbox.com/sh/5w9n5px144carg9/AACaevChEOPaxwCMaXO7uIbGa?dl=0](https://www.dropbox.com/sh/5w9n5px144carg9/AACaevChEOPaxwCMaXO7uIbGa?dl=0) I have done the meshes using the final layer thickness equal to 0.9 like in the modified simulation of homework 1. The fact is that I experience very small changes in the drag in the second case. What can cause such this behavior? Thanks a lot for the help Alessandro ---
**Author:** ![FernandoAlmeida](https://www.simscale.com/forum/letter_avatar/fernandoalmeida/32/5_5575768a8748004e209b776fc1b2916d.png) [@FernandoAlmeida](https://www.simscale.com/forum/u/FernandoAlmeida)\ **Post date:** [March 31, 2016, 6:20am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/29 "2016-03-31T06:20:26Z")
@l_trefiletti I tried to mesh it, but it shows that there is a problem in the CAD ---
**Author:** ![l\_trefiletti](https://www.simscale.com/forum/letter_avatar/l_trefiletti/32/5_5575768a8748004e209b776fc1b2916d.png) [@l\_trefiletti](https://www.simscale.com/forum/u/l_trefiletti)\ **Post date:** [March 31, 2016, 7:15am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/30 "2016-03-31T07:15:28Z")
Is the problem in the CAD or in the mesh? If itā€™s in the mesh, donā€™t worry and go ahead, I have the same problem ( I saw your mesh log) ---
**Author:** ![Namby](https://www.simscale.com/forum/letter_avatar/namby/32/5_5575768a8748004e209b776fc1b2916d.png) [@Namby](https://www.simscale.com/forum/u/Namby)\ **Post date:** [March 31, 2016, 11:14am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/31 "2016-03-31T11:14:41Z")
Hi @ggiraldo, I just wanted to say that I really appreciated your response to this post. It was definitely helpful to understand what was going on, and also a great reminder of vetting simulations and not trusting every pretty fringe plot thatā€™s generated. Thanks. ---
**Author:** ![ggiraldo](https://www.simscale.com/forum/user_avatar/www.simscale.com/ggiraldo/32/5226_2.png) [@ggiraldo](https://www.simscale.com/forum/u/ggiraldo)\ **Post date:** [March 31, 2016, 1:58pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/32 "2016-03-31T13:58:19Z")
Oh, this is a really kind answer from your part. Iā€™m so glad I could help a little bit! ---
**Author:** ![Namby](https://www.simscale.com/forum/letter_avatar/namby/32/5_5575768a8748004e209b776fc1b2916d.png) [@Namby](https://www.simscale.com/forum/u/Namby)\ **Post date:** [April 1, 2016, 3:30am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/33 "2016-04-01T03:30:48Z")
Has anyone run into the same problem I have? I finished all the runs (I ran 10 instead of 6, based on the table that was posted), but 3 of the runs are stuck and not producing results. The run status says 100%, but it does not show up in my post processor. And it finished 2 days ago. Here is a screenshot of an example. ![](https://www.simscale.com/forum/uploads/default/original/2X/4/42f2148ad0b0f4d958838879ca4c1548382bc2dd.png) Can someone please help resolve this? ---
**Author:** ![rahulsharma\_94](https://www.simscale.com/forum/user_avatar/www.simscale.com/rahulsharma_94/32/3804_2.png) [@rahulsharma\_94](https://www.simscale.com/forum/u/rahulsharma_94)\ **Post date:** [April 3, 2016, 12:47am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/34 "2016-04-03T00:47:53Z")
Ok, I have completed the simulaitons and have the results, but when I try to see the solutionfield so visualize the results, my browser just cloggs down for some reason, and canā€™t go past loading. 8GB RAM and i7 processor, with dedicated GPU as well. I donā€™t get it, chrome is worse of 'em all. In Firefox I can get to the point where I can select contours and crash. This way I canā€™t complete the homework to submit. ---
**Author:** ![anon18194957](https://www.simscale.com/forum/letter_avatar/anon18194957/32/5_5575768a8748004e209b776fc1b2916d.png) [@anon18194957](https://www.simscale.com/forum/u/anon18194957)\ **Post date:** [April 3, 2016, 7:52pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/35 "2016-04-03T19:52:31Z")
@Namby - this can happen from time to time if there is an interruption with the server when the simulation is being run (weā€™re working to fix this). For the three runs that are stuck, Iā€™d suggest creating a new run and re-running it - this should resolve the issue @rahulsharma_94 - based on the specs your computer should be fine for this, can you try again and let me know? Are you able to see the force plots? ---
**Author:** ![kpliontos](https://www.simscale.com/forum/letter_avatar/kpliontos/32/5_5575768a8748004e209b776fc1b2916d.png) [@kpliontos](https://www.simscale.com/forum/u/kpliontos)\ **Post date:** [April 3, 2016, 8:03pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/36 "2016-04-03T20:03:56Z")
@anon67859130 Hi everyone, Because of my ignorance about the software, i accidentally activated the free trial of the professional pack 12-13 days ago. This pack has only 200 core hours and i have unfortunatelly reached that limit due to the workload of the homeworks. From what i read, my account will be automatically reset to community plan at the end of the 14 day free trial. Unfortunatelly, i think that i will not make the deadline because the end of the free trial is sometime tomorrow (or even worse, the day after). I have done half of the homework though, as you can see in the link below, and it is a matter of just one hour to finish it. > **[SimScale Login](https://www.simscale.com/workbench?publiclink=eb471cae-c308-4bc1-847d-8c1752f88731)** > > Log in to your SimScale account. SimScale makes high-fidelity engineering simulation technically and economically accessible. At any scale. In the cloud. Would it be possible the deadline to get a small extension? Regards ---
**Author:** ![anon51803486](https://www.simscale.com/forum/letter_avatar/anon51803486/32/5_5575768a8748004e209b776fc1b2916d.png) [@anon51803486](https://www.simscale.com/forum/u/anon51803486)\ **Post date:** [April 3, 2016, 8:11pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/37 "2016-04-03T20:11:17Z")
Hi @kpliontos, I have switched your account back to a community user. The computing quota should be enough right now for you to continue working on the workshop. Please log in again, and check the account status. Feel free to message me, if you need more help! Cheers! ---
**Author:** ![kpliontos](https://www.simscale.com/forum/letter_avatar/kpliontos/32/5_5575768a8748004e209b776fc1b2916d.png) [@kpliontos](https://www.simscale.com/forum/u/kpliontos)\ **Post date:** [April 3, 2016, 8:21pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/38 "2016-04-03T20:21:27Z")
Thank you for the help! I am a community user again šŸ˜€ ---
**Author:** ![rahulsharma\_94](https://www.simscale.com/forum/user_avatar/www.simscale.com/rahulsharma_94/32/3804_2.png) [@rahulsharma\_94](https://www.simscale.com/forum/u/rahulsharma_94)\ **Post date:** [April 3, 2016, 10:11pm UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/39 "2016-04-03T22:11:05Z")
@AnnaFless Yup, it is fine, somewhat, Now the problem occurs, suppose I just added slice from the filter, and If i try adjusting the settings too many times, the browser hangs up. Also selecting the timestep for each of the simulations slows down the loading quite a lot. Anyways I am trying paraview instead. Thanks. ---
**Author:** ![marti](https://www.simscale.com/forum/user_avatar/www.simscale.com/marti/32/3750_2.png) [@marti](https://www.simscale.com/forum/u/marti)\ **Post date:** [April 4, 2016, 7:11am UTC](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204/40 "2016-04-04T07:11:40Z")
Do we need to use external post-processing or it is just fine to submit the link with the simulation project? [Previous page](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204.md?page=1) [Next page](https://www.simscale.com/forum/t/step-by-step-tutorial-homework-of-session-2/14204.md?page=3)