Solidworks is the most widely used 3d cad package in education and industry today. The high mach number problem you experience is most likely due to some cells that are too big in a small gap or sometimes it can happen that a cell is not so nice placed. I used real wall angular motion option in solidworks and. Hi i want to simulate an airfoil in high mach flow. How to model supersonic flows in comsol multiphysics. Running solidworks on a mac people often ask if it is possible to run solidworks on a mac the good news is you can. With a large size discontinuity between cell types, issues can arise including high mach number warnings dependent on geometry, solution divergence, and incorrect reported result values. If i turn off the high mach number flow then i get a warning that the flow is supersonic in too many cells and use of stopping is recommended. As the speed of the object approaches the speed of sound, the flight mach number is nearly equal to one, m 1, and the flow is said to be transonic. Learning solidworks helps you rise above your peers by developing the design and engineering skills you need to be successful for the next step in your education, or when it is time to enter the job market. A supersonic flow region, b shock wave, c area of separated flow. The supersonic flow over a supercritical airfoil terminates in a weaker shock, thereby postponing shockinduced boundary layer.
For uncompressible flows, bernoulli equation can be used, but in this example, the high mach number means that it would not be correct. Solidworks 2014 sp05 to disable web help from within solidworks and use local help instead, click help use solidworks web help. Theres plenty of excellent cad software avialable for mac nowadays but unfortunately solidworks for mac does not exist. We know quite a few users running solidworks successfully on a mac. Solidworks flow simulation is a new class of cfd computational fluid. There has been a lot of experimental and theoretical work done on space vehicle reentry, which involves high mach number flow. It allows for the estimation of broadband noise that turbulence generates. This can lead to supersonic flows with high mach numbers, sometimes with. The solidworks customer portal is a webbased hub for solidworks resources, allowing you to. High mach number flow existstho i m running the sim at. Is high mach number flow common in design engineering flow problem statements. All flow parameters are frozen, but the temperature of the solid is calculated using these fixed parameters at the outer of the boundary layer and user defined time step.
Solidworks welcomes your feedback concerning the presentation, accuracy, and thoroughness of the documentation. Mach number is a measure of the compressibility characteristics of fluid flow. High mach number flow existstho i m running the sim at 5ms. Browse these and more cfd module updates and features below. With an example of supersonic flow over a diamond airfoil, we have shown how these characteristics can be resolved in comsol multiphysics using the high mach number flow interface. Mach number static pressure total pressure environment pressure. How to define fluids in solidworks flow simulation computer. The shock angle and flow properties on the airfoil from our simulations are in good agreement with analytical estimates from inviscid compressible flow theory. Those graphics allow for the correction,modification,refining of the profile until matching the designer requirements. Problems with rotating areas and high mach numbers.
Solidworks is not available for mac but there are plenty of alternatives that runs on macos with similar functionality. I had to go through many online tutorials and books to solve this problemhigh mach. This webinar covers the setup of a tank fillingevacuation analysis, modeling fluids sloshing in a container and using the output tools in solidworks flow simulation to. Flow simulation treats flow freezing for the high mach number flows differently. Low mach number effect in simulation of high mach number flow.
If that doesnt suit you, our users have ranked more than 50 alternatives to solidworks and many of them are available for mac so hopefully you can find a suitable replacement. The most popular mac alternative is freecad, which is both free and open source. The issue is that if i set the high mach number flow option, then i get a warning that the mach numbers are too low the max is mach 1. In this model the high speed turbulent gas flow in a converging and diverging nozzle is modeled using the high mach number flow interface. In solidworks flow simulation 2018 you can reduce the analysis time when analyzing fluid flow or conjugate heat transfer in models consisting of axial periodic features. Solidworks flow simulation free surface flow youtube. Solidworks flow simulation takes the complexity out of computational fluid dynamics. In fluid dynamics, the mach number m or ma is a dimensionless quantity representing the ratio of flow. Flow type set to laminar and turbulent and high mach number flow selected. Pdf simulation study of supersonic natural laminar flow on. If the mach number is near one, the square of the mach number is also nearly equal to one. The assumptions made in the proudman derivation are as follows see fig. You can specify how much of the machines resource to give to the windows os which is where a high spec mac will stand you in better stead. In this study, the compressible turbulent flow through a supersonic ejector is modeled using the high mach number flow interface in the cfd module.
For transonic flows, the change in density is nearly equal to the change in velocity, and. Hi, i am making a study about propeller at the moment. In this note, we relate the two wellknown difficulties of godunov schemes. Mach number limitation on flare system posted in relief devices forum. Access the knowledge base, containing a wide range of technical documents and resources. Advanced boundary cartesian meshing technology in solidworks flow simulation 4 the approach that uses the immersedbody mesh figure 4 is the alternative to the bodyfitted approaches shown in figures 1 to 3. Im designing a rocket nozzle, so i know that theres going to be high mach number, and when i use the solver without high mach number option selected, it completes fine but gives me a bunch of warnings about supersonic flow. The bad news is that it isnt supported by solidworks there are no versions of solidworks that are written for mac os and os x, however there are. High mach number flow exists tho i m running the sim at 5ms. It seems like a fairly specialised application, or am i mistaken.
All of them will provide you with the necessary tools to create amazing cad computeraided design projects. Sign up for the most popular cad software now available on mac. Solver abnormally terminated when using high mach number. The low sonic number warning appears to go away after a certain number of iterations. Check out solidworks system requirements to ensure you are always working with a solidworks supported and optimized system for hardware, operating system and microsoft products also apple, mac 10. Find the latest versions of solidworks software and service pack updates is there a solidworks for mac.
You can simulate the problems within a sector including rotation andor heat conduction in solids. Because there is a huge body of work in both areas, it makes it relatively easy to validate cfd results against actual results. Select the high mach number flow check box if you want to analyze highvelocity gas flows flow mach number is greater. Other improvements to the transient solver include the. Subsonic conditions occur for mach numbers less than one, m 1. It is always a good rule of thumb to assign half the available ram to the windows os, so in my set up, i assigned 4gb of ram. What is the effect of inlet mach number for centrifugal. When performing the simulation, the rotation axis should be parallel to one of the global coordinate system axes. For the lowest subsonic conditions, compressibility can be ignored.
Deliberately not conforming the mesh to the solid surface makes it possible to use a cartesian mesh, which in. With the full solidworks flow simulation product, you have the following advanced functionality. As modeled in the international standard atmosphere, dry air at mean sea level, standard temperature of 15 c 59 f, the speed of sound is 340. The intuitive design interface and integrated software work together and give you the freedom to focus on innovation, thus giving you the possibility to span multiple disciplines with ease. I believe it may be that the smaller time steps used in high mach number simulation means that the flow takes longer to develop past the choke and into the supersonic nozzle. There has also been a lot of work done on supersonic aircraft. Solidworks flow simulation uses the proudman formulae for the noise prediction calculation. Solidworks flow simulation cad design technologies cadtek. Mach number limitation on flare system relief devices. The diffuser is transonic in the sense that the flow at the inlet is subsonic, but due to the contraction and the low outlet pressure, the flow accelerates and becomes sonic ma 1 in the throat of the nozzle.
What you need to know for solidworks flow simulation in 2016. Hi all, most of us have known the mach number criteria for sizing a psv tail pipe and the flare header. For calculations with the high mach number flow option enabled, the following energy equation is used. If you use a virtual machine such as parallels, you can switch between macos and solidworks at anytime seamlessly alternatively, you can install solidworks using.
Conventional 1 and supercritical 2 airfoils at identical free stream mach number. At some places on the object, the local speed exceeds the speed. Transonic flow in a sajben diffuser comsol multiphysics. Each company would have their own criteria, but normally maximum mach no of 0. For more information, call us on 01223 200690, or visit. Using this axial periodicity you need to calculate the fluid flow only for a sector instead of the entire model. Solver abnormally terminated when using high mach number option in flow simulation. Why does solidworks flow simulation do high mach number flow. Here you can find the most popular applications that can replace solidworks for mac. Solidworks flow simulation noise prediction goengineer.
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