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Converge cfd forum. Quote: Originally Posted by jetcheve. But another question: so to restart the simulation I should change in the terminal the restart_flag to 1 or open converge studio, change in Simulation Parameters>Run Parameters>Run Mode>Restart and then export again the input files to the same folder of the previously simulation? FORUM. Hi, I am running some IC spark-ignited engine simulations, and I am running into some errors outputted by Converge when I use a fine mesh. Welcome to the CFD Online Discussion Forums. The time now is 02:02. CONVERGE - Topics related to the software packages sold by Convergent Science. So it doesn't look like there's a hardware problem. Posts: 7 Rep Power: 5. CONVERGE, Page 18 - Topics related to the software packages sold by Convergent Science. Hello! Let me address these one by one. And, from the bottom of the CFX-Pre window, the dimensions look right. Member . Threads Tagged with converge cfd : Home; News. If you are trying to use the AMGX library and mixing it with the BiCGStab solver, I think it is better not to use GPU (since you would probably not see much speed-up) or use CONVERGE_BICGSTAB_GPU as the linear solver without specifying the AMGX configuration CONVERGE, Page 4 - Topics related to the software packages sold by Convergent Science. however, we want to investigate the performance, combustion and emission of the SI engine fueled with natural gas/hydrogen blends. 4 but no improvement. 1 KB, 19 views) March 4, 2021, 16:25 #2 Hi, It could possibly be an issue which is case specific, as I have not been able to reproduce the issue on my end. 1 (which is the default setting), but it reaches only 0. The time now is 12:13. The time now is 09:17. As looking closer to issue, it seems that it would generate a stuck parcel warning if the fuel parcel hit the cylinder wall. jpg (43. Posts: 9 Rep Power: 5. 10000001 within the (default) 30 steps - you will get the "BICGStab did not converge" message, although there's nearly no difference in the solution. why when I want to move the piston toward compression ratio the piston moves very ridiculous, by the way, I already make the cylinder close. You may not post attachments Hi, i am using CONVERGE for Gasoline PFI and DI engines. I'm a mechanical engineering student and I'm trying to learn how to use Converge Studio 2. Members of the Convergent Science Applications team monitor the CONVERGE CFD software provides efficient, accurate product design analysis. 0 is widely used in the natural gas engine in modelling community. Our flagship product, CONVERGE, is a revolutionary CFD software with truly autonomous meshing capabilities that eliminate the Periodic Boundary conditions for turbulent flow in ANSYS fluent? You may not post new threads. Main CFD Forum: 1: December 16, 2013 12:39: burning of solid fuel lizihujx: FLUENT: 8 Forum: Replies: Last Post: CFD simulation of gas cicrcuit breaker in fluent with dynamic meshing. Our flagship product, CONVERGE CFD, is a revolutionary CFD software that Hello, I do not think there is anything to exclude Windows OS from GPU usage. 39967e+23 hi, you can consider it as a label. Numerical methods: Given the total temperature and total If you need personalized assistance with a simulation, post your questions on the CFD Online CONVERGE forum. Members of the Convergent Science Applications team monitor the forum and provide expert guidance. So any idea how can i force swirl motion into the converge. The solution timing is a variable timing as most Converge example case did. you should place samplePoints in your domain and track the iteration behaviour of those points. 4 (it's the first CFD software I ever used, so I'm a complete beginner). DOI: 10. Generally, the GRI 3. Please use your official email for all correspondence with Convergent Science. Our flagship product, CONVERGE, is a revolutionary CFD software with truly autonomous meshing capabilities that eliminate the grid generation bottleneck from the simulation process. Home > Forums > General Forums > Main CFD Forum. An online center for Computational Fluid Dynamics. First, in that paper, mass flow rate is used as the boundary condition for the fuel injection, but in CONVERGE, if mass flow has been selected in velocity boundary condition the box of total pressure can’t be selected in pressure boundary condition. The maximum number of the cell is set below 600k and the simulation time is very long (a Sent from my HUAWEI TAG-L01 using CFD Online Forum mobile app August 10, 2017, 05:09 #3: Blanco. (if i calculate with 36 cores, system shows some warning like "some cores has no mesh to calculate") frictional drag estimation in numerical methods is sth directly related to the wall treatment you have in the problem; and so you might have a solution of adequately accurate flow field but not drag coefficient. Forum: Replies: Last Post: can't converge in FLUENT: ok___ko: FLUENT: 1: April 30, 2013 03:47: Gmres fails to converge, but LU is fine: sbabbi: Main CFD Forum: 1: April 11, 2013 09:54: k and epsilon were hard to converge in multiphase model of Fluent: Yanlong Li: ANSYS: 0: January 2, 2013 06:25: HELP !In relaxtion factor converge is taken or Usually the only way to get this one to converge to the desired critereon is by changing to a true transient simulation with a fine enough timestep. The fuel injection setup is identical as the available Converge GDI SAGE model. If you proceed with the analysis with the example provided by converge, it will work well, and you can proceed with the analysis you made in the past. In ANSYS I have to make sure the residual graph to fall below an error criteria. I read converge manual and converge studio manual and Have anyone use converge cfd for external flow or Renewable energy? Can it simulate moving object + AMR? If it can, how does it perform i. TKE) August 22, 2019, 11:11 # 3 I am checking the results of a CONVERGE simulation with a theoretical model and I keep on getting different heat transfer coefficients. Tumble), but some need lower ones (e. All what is needed is the fuel within the engine and a suiting reaction mechanism and a Ignition source. Thank you. 1 - This literally means a film parcel is stuck. 398 -3. However, you can enable Case Setup > Output/Post-Processing > Output files > Dynamic output options and provide a rotation matrix to change your my problem is that k and epsilon residuals are not converging. Be sure to mention that you’re a CONVERGE Explore participant, include Convergent Science is an innovative, rapidly expanding computational fluid dynamics (CFD) company. CONVERGE CFD Software. out values are region-based. accuracy and computation time. Gohil said in his virtual training that the max number of nNonOrthogonalCorrectors, for accurate results, is 20. CONVERGE, Page 25 - Topics related to the software packages sold by Convergent Science. You may not post attachments Through the CONVERGE forum at CFD Online, you can exchange ideas with and learn from other CONVERGE users. i tried to reduce the URF for these two from 0. Main CFD Forum; System Analysis; Structural Mechanics; Electromagnetics; CFD Freelancers; Hardware Forum; Lounge; Software User Forums Main CFD Forum: Page 1 of 2: 1: 2 > All times are GMT -4. CONVERGE, Page 6 - Topics related to the software packages sold by Convergent Science. Sometimes you just want to talk to other CONVERGE users, and Convergent Science is dedicated to facilitating peer-to-peer discussion. Saket. On our CFD Online support After reading the FAQ, Ansys User Guides, and searching the forum it is still not clear what criteria must be met to ensure a transient simulation has converged! I know there is The CFD Online CONVERGE forum is a platform where you can discuss CONVERGE questions with other CONVERGE users and our support engineers, who regularly monitor the forum. Posts: 53 Hello, Converge simulation is giving below error WARNING: there may be an alignment error. Join Date: Mar 2009. ANSYS. Since I am pretty new to CFD, I was just following tutorials where they only looked at the residual graph. CFX; FLUENT; Meshing & Geometry (htc_map/heat transfer coefficient map) to cycle-average near-wall data from a CONVERGE CFD simulation and map the result to another surface for such purposes. CONVERGE outputs dynamic. If I tried the steady state simulation, the residual looks like this: Still way Description of the problem: The physical model is a labyrinth seal, the inlet is supercritical state, and the outlet is two-phase state. Convergent Science is headquartered in Madison, Wisconsin, and has offices in the United States, Europe, and India and distributors worldwide. 2514/6. Menu Login Explosive Mode Analysis of Non-Ideal Combustion in a Non-Premixed Rotating Detonation Engine,” AIAA SciTech 2020 Forum, AIAA 2020-2161, Orlando, FL, United States, Jan 6–10, 2020. Converge solution for Wall film Model User Name: Remember Me: Password: Register: Blogs: Community: New Posts: Updated Threads: Search Converge solution for Wall film Model #1: Jeeloong. Home > Forums > Software User Forums > CONVERGE. Hi, I want to simulate the H2/CNG fuelled SI engine using CONVERGE v3. Location: United Kingdom. From engines to Refer to these for information on surface preparation, case setup, simulation, and post-processing of some basic CONVERGE example cases. g. Location: India. But in autodesk I Convergent Science is an innovative, rapidly expanding computational fluid dynamics (CFD) company. The experimental data that we have is taken using 2 valve engines (one for Simulation of H2 fuelled engine in CONVERGE -- CFD Online Discussion Forums Discussions about ANSYS Meshing, DesignModeler, ICEM CFD, TGrid, GAMBIT and other meshing and geometry tools from ANSYS. Convergent Science’s white papers I'm working on my Mechanical Engineering bachelors dissertation of an ANSYS Fluent CFD simulation and analysis of a spaceplane during atmospheric re-entry, but I've been having trouble getting my simulations to reliably execute and Hello, I'm running few simulations, and I found myself in "confusion" how to check converge in autodesk CFD. Through the CONVERGE forum at CFD Online, you can exchange ideas with and learn from other CONVERGE users. com (or your existing support contact) with your case setup and someone can look into this. So I would like to kno how CONVERGE calculates the heat transfer coefficient. How do i make my solution converge? I have no problems with this when running high reynolds number though. CONVERGE, Page 24 - Topics related to the software packages sold by Convergent Science. Blanco. Please feel free to get in touch with the Support team at support@convergecfd. I've simulated an example case, and now I'm trying to play with the injectors location. Trushar B. I looked in the Theory Manual, as well as the CONVERGE studio manual, but I cannot find any explanation on this matter. CONVERGECFD April 6, 2022, 06:07 Reg: H2 mechanism #7: pradeep. The maximum dot product of the motion vector with a non-movi CONVERGECFD March 26, 2021, 02:27 #3: Sahus. if they are not changing much, probably your problem is converged, considering your flow physics and numerics. Senior Member . Dr. Main CFD Forum: 8: August 15, 2003 00:19: All times are GMT -4. You may not post replies. Join Date: Dec 2020. Main CFD Forum: 3: October 21, 1998 08:05: All times are GMT -4. New Member . Only logged in users can post messages. Join Date: Jan 2015. More Then comparing results, you should see some values converge at higher grid sizes (e. Rif March 6, 2008, 01:29 converge of solution: bbasal: Main CFD Forum: 0: February 13, 2010 02:58: My Solution wont Converge!!! Chris: FLUENT: 6: April 16, 2005 18:57: what to do when solution doesn't Hi all, Currently, I simulated the SI engine fueled with natural gas/hydrogen blends. stalling residuals are not telling if a solution is converging or not, i know that this behaviour is annoying. I am already using H2 chem kin file from LLNL. 22. thus although there are still some physical aspects of the flow not captured, in some cases you can use the calculated flow variables. Nonmanifold Problem User Name: Remember Me: Password: Register: Blogs: Community: New Posts: Updated Threads: Search LinkBack: Thread Tools CONVERGECFD Tags: converge cfd, convergence check, nonmanifold errorr Main CFD Forum: 0: October 16, 2008 08:30: Looking for Laminar Flame Codes John: Main CFD Forum: 0: September 17, 2005 20:13: About the laminar jet diffusion flame length Sheng Chen: Main CFD Forum: 1: July 10, 2004 02:07: correlation for laminar flame speed cfd-user: Main CFD Forum: 0: November 28, 2003 08:27 Hello Everyone, today while running LES for a single cylinder SI engine I encountered the following warning: cell pair is below the min_volume Please CONVERGE, Page 10 - Topics related to the software packages sold by Convergent Science. 5% still remaining in the cylinder. CONVERGE, Page 3 - Topics related to the software packages sold by Convergent Science. i also tried to use second order discretization for these two, but no improvement. Like there is no direction change too and no swirl. raju. I am using 2nd order upwind. If it is ICE modeling you are interested, while CONVERGE is a tool specialized on ICE CFD applications, OpenFOAM has a lot of recent developments towards reacting flow simulations The CFD Online CONVERGE forum is a platform where you can discuss CONVERGE questions with our support engineers, who regularly monitor the forum, and other CONVERGE users. How does converge handles the connectivity of elements? From what I see, it has a face-based connectivity using an array of all face nodes(per face node), an array of indices to the first array, and an array for elements connectivity with some numbers positives and some other negatives. You may not post new threads. This is a free community for everyone interested in Computational Fluid Dynamics. For example, everthing in the cylinder is labeled by the "CYLINDER" passive at the start of the simulation, so after the gas exchange you can trace these and see e. Main CFD Forum; System Analysis; Structural Mechanics; Electromagnetics; CFD Freelancers; Hardware Forum; Lounge; Software User Forums. Join Date: Nov 2020. This is the largest CFD site on the net with services like discussion forums, jobs, links and a wiki. Virtually test design options and identify potential problem-areas before manufacturing. [ANSYS Meshing] Help with Structured by Gert-Jan CONVERGE, Page 23 - Topics related to the software packages sold by Convergent Science. I am trying to use converge to simulate a diesel fuel combustion in micro-channel. dynamic_region*. I am totally a new user of converge. Hello, Although short time intervals are commonly used to reach convergence, orthogonal issues should be considered as well. 4 717. However, I still wanna check the dimensions inside. I have always worked with SAGE, because it is pretty straight forward. I am using CONVERGE to simulate the combustion in cylinder. (towards TDC). If your problem is implicitly unsteady (or even worse explicitly unsteady) then your solution at different iterations of a steady state solver can still oscillate. 2020-2161 CONVERGE, Page 8 - Topics related to the software packages sold by Convergent Science. 4 and further to 0. But depending on what you are trying to do, the original not-quite-converged steady state solution might be OK as some sort of average response. Mahesh7238: FLUENT: 1: April 5, 2021 01:21: CFD Simulation of Exhaust Gas Dispersion into Atmosphere from Industrial Stack: Mehul Patel: ANSYS: 2: March 12, 2018 03:11: A general interface question about two phasing simulation using CONVERGE: tmy CONVERGECFD Tags: Main CFD Forum: 0: May 24, 2011 18:55: Why the body is solid but not fluid when the NX file import into the DM? ddx: ANSYS Meshing & Geometry: 1: December 27, 2010 23:13: CFX4. out which contains information on Swirl Ratio and Angular Momentum in each direction. Attached Images. I cannot read the CFX help because of JAVA, maybe, problem (from the answer for the "HELP" problem in this forum). e. 0. By default, the swirl axis is the Z axis. Main CFD Forum: 17: August 1, 2007 11:15: Hydrogen Air combustion in a combustion chamber popi: CFX: 7: July 11, 2007 19:40: NOx Formation Forum: Replies: Last Post: Viscous force and coefficient viscous force: tobino: Main CFD Forum: 0: February 20, 2011 22:06: User-defined force transfer across FSI interface: vivekcfd: CFX: 7: March 10, 2010 21:43: Urgently Need the code of Lift force and VM force Kai Yan: Main CFD Forum: 0: July 16, 2008 08:07: DEFINE_CG_MOTION and pressure Solution Does Not Converge Rif: Main CFD Forum: 3: March 7, 2008 06:33: What to do if solution doesn't converge Sharon: FLUENT: 1: February 15, 2007 01:40: TRANSIENT SOLUTION CONVERGE MARK: Main CFD Forum: 3: November 2, 2006 11:08: what to do when solution doesn't converge? Jenny: CFX: 5: January 28, 2004 05:00: Energy -> temperature conversion failed to converge: iter Test e/h Cv/p Tnew 0 293. 3 -build analysis form Chie Min: CFX: 5: July 13, 2001 00:19: All times are GMT -4. 15 -89186. and amr function of converge make mesh increase. Hi. CONVERGE, Page 22 - Topics related to the software packages sold by Convergent Science. 8 to 0. Index; Post News; Subscribe/Unsubscribe; Forums. There's no guarantee that a steady-state solver will converge to the time-averaged solution of an unsteady problem. so, for example, early stage of calculation does't need many cores. Pradeep Raju. because the convergence I did choose the right dimension when I import the mesh from ICEM CFD. This For example, the convergence criteria for the AMG solver is 0. g.

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