It is best suited for simulating large material deformation or failure. Ansys provides free student software products perfect for work done outside the classroom, such as homework, capstone projects, student competitions and more. The algebraic multigrid amg solver for fluent simulations can be. Overview of gpu suitability and progress of cfd applications. Rongguang jia principal engineer, team leader of ansys.
When i change all of the equation cycles to fcycle, i encounter 1. Anss, the global leader and innovator of engineering simulation software, announced today that it has entered into a definitive agreement. One notable leap forward is the introduction of gpu computing in fluent. In order to improve performance and also to let user take advantage of the available gpu hardware, we provide a mechanism in ansys fluent to off load the linear solver on to a gpu using nvidias multigrid amg so\ lver. Ansys is a global leader in computeraided simulation software. Divergence detected in amg solver and floating point exception in ansys fluent. Ansys and photonic simulation leader lumerical sign. Are there any other alternative softwares to ansys and. The ansys academic program empowers students through free student software, the sponsorship of more than 500 student teams and the ansys student community, which allows users to. Amgx can even use mpi to connect clusters of servers to solve very large. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. In this paper, simple tests are first carried out to confirm the features and capabilities of dds and amg for different types of analyses.
Hi guys, im working on a subsonic symmetric airfoil and i used the pressure farfield boundary condition. After the detected error, i used pseudo trandient method, but nothing was changed. Evgeny ivanov senior software developer ansys, inc. I get the warning from fluent 17 divergence detected in amg solver. It enables fast and accurate analysis of rigid and flexible bodies and gives accurate evaluation of physical events through the analysis of the mechanical system as a. But when i turn the equationterm back on, fluent crashes. In this talk we present a top level view of the architectural design of integrating the amgx solver into ansys fluent. The ansys workbench platform is the backbone for delivering a comprehensive and integrated simulation system to our customers. Stabilizing pressure coupled to enhance linear solver robustness. The direct solver using the dense matrix is selected for a small scale problem. Using workbench for your product development simulations will result in higher productivity from integrated applications leveraging common and compatible data models. When i set that term to zero or just tell fluent not to solve that uds equation, the solver can pass through 92 time steps without issue.
Autodyn provides advanced solution methods without compromising ease of use. It comprises development of new features in the solver whilst ensuring the current features work as intended and also includes solving any defectsissues that. But avoid asking for help, clarification, or responding to other answers. Fluent diverging divergence detected in amg solver. For the jcg and iccg solvers with unsymmetric matrices, and for the qmr solver, the default is 1. Fluent uses amgx as its default linear solver, and it takes advantage of a cudaenabled gpu when it detects one. Ansys cfd enterprise designed for experts who need to solve the toughest problems, this comprehensive simulation package includes everything in ansys cfd premium plus specialty solvers and analysis software to deliver the fastest, most accurate results across the widest array of applications, all the time, without compromise. Ansys solution psi evaluates and implements the new technology in software ansys 15.
Hi, i currently using ansys apdl with the pcg solver for a contact analysis. I have a working model, and i am confident in the result. I am running multiple analysis that are writting over each other one after an ot ansys pcg solver ansys. Im working on solidification simulation analysis using ansys fluent. The gaussseidel procedure can be illustrated using the scalar system, equation 18.
In the latter case, the amgx library is used to perform the solution of linear systems. As i reduce the cfl number less than 1, my solution converges, but there is severe numerical diffusion. And the amg iterative solver is selected for a large scale problem. When run the simulation with same conditions in ansys 2019 r2 it got. I am modeling boiling in a vertical tube in fluent 14. Anyone knows how to get rid of divergence detected in amg solver. Jan 27, 2017 air flow analysis on a racing car using ansys fluent tutorial must watch kindly find the below link to download the hands on file. Ansys student products can be installed on any supported ms windows 64bit machine. Nvidia partnered with ansys, provider of the leading cfd software fluent to develop a highperformance, robust and scalable gpuaccelerated amg library.
The fluent amg solver now takes advantage of single or multiple gpus in the pressurebased solver. Air flow analysis on a racing car using ansys fluent tutorial. Part of the team that develops and maintains the explicit dynamics solver in ansys. Assuming you have software at the university please can you contact the local team. My material is a fluid with the density, cp, and viscosity, function of the temperature. Thermal, structural, acoustic, piezoelectric, electrostatic and circuit coupled electromagnetics are just an example of what can be simulated. The ansys finite element solvers enable a breadth and depth of capabilities unmatched by anyone in the world of computeraided simulation. Advancing analysis capabilities in ansys through solver. This will display amg residuals for each equation during the iteration. Accelerating ansys fluent simulations with nvidia gpus. Cfd applications typically scale well across multiple processor cores and servers, have modest memory capacity requirements, and typically perform minimal disk io while in the solver. The ansys multifield solver employs robust, iterative coupling in which each physics discipline is solved sequentially and convergence is obtained.
Ansys fluent software supports solver computation on nvidia gpus. Ansys structural mechanics structural mechanics solutions from ansys offer bestinclass simulation tools for product design and optimization that increase productivity, minimize physical prototyping and help deliver better and innovative products in less time. The type of solver used in the analysis is set from the setup model setup parameters or rightclick the analysis type entry in the tree view and choose edit analysis. For the jcg and iccg solvers with symmetric matrices, and for the amg solver, the default is 1. Jan 15, 2018 dear all, i do simulation on ribbed tube but mesh in laminar flow. Complex physical phenomena such as the interaction of liquids, solids. Devishta lumbaa software developer ii ansys linkedin. I have tried some of the suggestions given but still same amg solver problem. Take your engineering simulation to a new level with simulationdriven ansys software simulation. The algebraic multigrid amg solver for fluent simulations is computationally intensive and in flowonly problems typically the coupled solver spends about 6070% of runtime solving the linear system using amg. Ansys fluent software supports solver computation on nvidia graphics processing units. These solutions tackle realworld analysis problems by making product development less costly and more reliable. Ansys software computer aided engineering cae software. The ansys multifield solver enables users to solve multiphysics problems by using automated implicit sequential coupling, which couples multiple singlephysics models in one unified simulation.
Dec 04, 20 when the function of automatic selection of an equation solver is opted, an appropriate solver is used on the basis of the problem size. How do i deal with this error message in ansys fluent. Hi all you expert ansys users, i was hoping to get some feedback on one of my models that i am running. Divergence detected in amg solver cfd online discussion. May 27, 2017 there are plenty of simulation software solutions that compete with them. With the finite element analysis fea tools available in the suite, you can customize and automate solutions for your structural mechanics problems and parameterize them to analyze multiple design scenarios. Try turning on amg verbosity from the multigrid controls panel. Our renewable products can be downloaded by students across the globe.
I have a furnace at 1500k with inside the flue gas and outside i created an enclosure with air at ambient temperature. Why am i getting temperature divergence in amg solver. Thanks to ansys fluid dynamics simulation solutions speed and unmatched scalability on highperformance computer clusters, we are able to quickly and accurately assess the performance of a. This means that workstations and clusters can be augmented with gpus to maximize the benefits of hardware and software investments. Customization and automation of structural solutions is much easier to optimize thanks to new and innovative finite. Ansys student software surpasses one million downloads. Thanks for contributing an answer to engineering stack exchange.
Based near pittsburgh, pennsylvania, the companys software applications help engineers solve their most complex design challenges through engineering simulations in areas such as fluid dynamics, electromagnetics, and structural mechanics. Optimize load balancing algorithms to have a more scalable multiphysics solver 4. Ive implemented the approximate roe solver, but i seem to be getting numerical diffusion unless i set the cfl number exactly equal to 1 this problem was recently explained in this post. For example, modal analysis has an iterative solver subspace which is a variation of the iterative solver available in linear static stress amg, or algebraic multigrid. Stabilizing xmomentum to enhance linear solver robustness. Nvidia partnered with ansys to develop a highperformance, robust and scalable gpuaccelerated amg library. Home forums software user forums ansys fluent fluent udf and scheme programming.
Ansys and nvidia collaboration roadmap release ansys mechanical ansys fluent. The multifrontal solver is selected for a midscale problem. Ansys cfx software is a computational fluid dynamics cfd application recognized for its accuracy, robustness and speed with rotating machinery applications. When enabled, you can use gpu acceleration for amg computations on linear systems. Ansys motion, now in the mechanical interface, is a third generation engineering solution based on an advanced multibody dynamics solver. With the finite element analysis fea solvers available in the suite, you can customize and automate solutions for your structural mechanics problems and parameterize them to analyze multiple design scenarios. Divergence detected in amg solver and floating point. After some playing around, the source term for the uds seems to be the culprit.
Ansys structural analysis software enables you to solve complex structural engineering problems and make better, faster design decisions. With unequaled engineered scalability, a multiphysics foundation, and adaptive architecture, ansys software delivers more power and better results than other cae tools. Benchmark tests on ansys parallel processing technology. As i start the simulation of bubble column airwater system, just after 15 iterations, it displays floating point exception and shows divergence detected in amg solver. Both point or block method gaussseidel smoothers are available in ansys fluent to solve for either the scalar amg system of equations or the coupled amg system of equations. Multigrid accelerated linear solvers for industrial. View rongguang jias profile on linkedin, the worlds largest professional community. Amg 6070% amg gpu fluent solution time cpu in flow problems, pressurebased coupled solver typically spends 6070% time in amg where as segregated solver only spends 3040% of the time in amg higher amg times are ideal for gpu acceleration, thus coupledproblems benefit from gpus. I am doing a cfd simulation for plate heat exchangers. On the other hand, segregated solver spends only 3040% of runtime in amg computation.
How can i control divergency in amg solver in fluent software. Improve core solver scalability beyond 50k cores, with further optimization of partitioning and amg solver 3. Ansys offers a comprehensive software suite that spans the entire range of physics, providing access to virtually any field of engineering simulation that a design process requires. For more details and accessing my case file, please check the link below so you. Hi, i am trying to simulate a gas mixing situation by the species transport model in fluent. Organizations around the world trust ansys to deliver the best value for their engineering simulation software investment.
To extend the ability and accessibility of the software by a group of users it is necessary to use network access and a powerful solver. Ansys autodyn simulates the response of materials to short duration severe loadings from impact, high pressure or explosions. Ansys fluent software supports solver computation on nvidia graphics processing units gpus to help engineers reduce the time required to explore many design variables to optimize product performance and meet design deadlines. Solvers in finite element analysis simulation mechanical. The important thing is to have your expectations clear.
Dec 20, 20 also, gpus can be used with the amg coupled pressurebased solver in ansys fluent, with benchmarks here showing a speed up of up to 2. Ansys structural mechanics ozen engineering and ansys. Acceleration of multigrid linear solver inside ansys fluent. During the iteration, you will see the residuals of the multigrid subiterations. When using the pcg lanczos mode extraction method, the default solver tolerance value is 1. Integration of amgx, a library of gpuaccelerated solvers developed by nvidia, within fluent makes this possible. Setting it to larger than that will report vast quantities of information. With ansys structural analysis software, users are able to solve more complex engineering problems, faster and more efficiently than ever before. Io, load balancing, particle tracking, amg solver, and so on. The role is a blend of putting engineering and software development knowledge to use in conjunction. Anyone knows how to get rid of divergence detected in amg. There are differences in the features provided and hence the industries they are suitable for. Qualification of ansys software as a framework of cfd and.
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