This website uses cookies to function and to improve your experience. By continuing to use our site, you agree to our use of cookies. Slice plotswhich can be applied to many model types, show a cross-sectional surface sometimes several of them that indicate how a variable changes over a distance or a specific area of the plot. This is done by plotting a virtual surface that vertically slices the geometry down the middle. To create these slice plots, we can add a new 3D plot group in the Flow in a Pipe Elbow model.

Following that, we can head up to the ribbon and choose Slice from the 3D Plot Group tab. Note: In the version I present here, I have added some plot outlines and a gray surface to help give a feel for the pipe shape — to give it a wall, if you like. This makes for better visualization for the purpose of this blog post. COMSOL Multiphysics automatically plotted the velocity on five surfaces that lie on yz -planes and shift in the x -direction. Suppose that we want to see the velocity on a slice right in the pipe bend that is perpendicular to the wall.

This will allow us to create a diagonal plane in the right-angle bend. These can be found under the Global Definitions node:. The inlet and outlet length, or the length from one open end of the pipe to the bend, are represented by the variable L.

The normal vector needs to be tangent to the direction of flow around the bend, so in the direction of 1,1,0 at the location of the point. This diagonal slice shows the velocity gradient as the fluid changes direction to follow the pipe. The fluid is moving slowest on the outside of the curve and faster toward the inside.

Now we can add a few slices, defined by yz -planes and xz -planes, to tell us the velocity in the horizontal and vertical sections of the pipe.

Tip: I did this by duplicating the original slice plot twice, rather than creating two new plots. I also chose Slice 1 under the Inherit Style tab in the settings for both of the duplicate plots, so that the color and data ranges will be the same for all three. Their respective normal vectors are 1,0,0and 0,1,0 :. What happens if we check the Additional parallel planes box? In the Slice 3 plot, it will create a series of surfaces that run parallel to the one created by the plane data:.

This looks a little messy, but bear with me for a minute. Remember that interactive slider we saw earlier? If we want to get rid of that long surface in the vertical section of the pipe, we can shift everything over a little. If all the surfaces are shifted by 0.

We can repeat this process with the horizontal surfaces whose normal vector is 1,0,0 :. Now the series of slice plots shows the velocity change in a cross section as water flows through the pipe, with the fluid flow becoming more turbulent after the bend. Stay tuned for our next installment in the postprocessing series: contour and isosurface plots. This consent may be withdrawn. For streamlines in a plane, you need to use a different method.

Then, you can create a 2D plot which uses said Cut plane, in which you can add streamlines, or other types.

### Using Slice Plots to Show Results on Cross-Sectional Surfaces

We would like to plot a set of streamlines, of given starting points in the entrance of a pipe, emerging a cross section at the outlet. We can see the inlet but at the outlet the plot has no sense.

Could you please give us a detailed way to achieve this graph? You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' or the latest version listed if standards is not an option. North America. Log Out Log In Contact.

Which graph represents the rational function brainlyOK Learn More.This website uses cookies to function and to improve your experience. By continuing to use our site, you agree to our use of cookies. Engineers and scientists use finite element analysis FEA software to build predictive computational models of real-world scenarios.

The use of FEA software begins with a computer-aided design CAD model that represents the physical parts being simulated as well as knowledge of the material properties and the applied loads and constraints. This information enables the prediction of real-world behavior, often with very high levels of accuracy.

The accuracy that can be obtained from any FEA model is directly related to the finite element mesh that is used. The finite element mesh is used to subdivide the CAD model into smaller domains called elementsover which a set of equations are solved.

These equations approximately represent the governing equation of interest via a set of polynomial functions defined over each element. As these elements are made smaller and smaller, as the mesh is refined, the computed solution will approach the true solution. This process of mesh refinement is a key step in validating any finite element model and gaining confidence in the software, the model, and the results.

A good finite element analyst starts with both an understanding of the physics of the system that is to be analyzed and a complete description of the geometry of the system. This geometry is represented via a CAD model. A typical CAD model will accurately describe the shape and structure, but often also contain cosmetic features or manufacturing details that can prove to be extraneous for the purposes of finite element modeling.

The analyst should put some engineering judgment into examining the CAD model and deciding if these features and details can be removed or simplified prior to meshing. Starting with a simple model and adding complexity is almost always easier than starting with a complex model and simplifying it.

The analyst should also know all of the physics that are relevant to the problem, the materials properties, the loads, the constraints, and any elements that can affect the results of interest. These inputs may have uncertainties in them. For instance, the material properties and loads may not always be precisely known. It is important to keep this in mind during the modeling process, as there is no benefit in trying to resolve a model to greater accuracy than the input data admits.

Once all of this information is assembled into an FEA model, the analyst can begin with a preliminary mesh. Early in the analysis process, it makes sense to start with a mesh that is as coarse as possible — a mesh with very large elements. A coarse mesh will require less computational resources to solve and, while it may give a very inaccurate solution, it can still be used as a rough verification and as a check on the applied loads and constraints.

After computing the solution on the coarse mesh, the process of mesh refinement begins. In its simplest form, mesh refinement is the process of resolving the model with successively finer and finer meshes, comparing the results between these different meshes.

### Multiphysics Cyclopedia

This comparison can be done by analyzing the fields at one or more points in the model or by evaluating the integral of a field over some domains or boundaries. By comparing these scalar quantities, it is possible to judge the convergence of the solution with respect to mesh refinement. After comparing a minimum of three successive solutions, an asymptotic behavior of the solution starts to emerge, and the changes in the solution between meshes become smaller.

Eventually, these changes will be small enough that the analyst can consider the model to be converged. This is always a judgment call on the part of the analyst, who knows the uncertainties in the model inputs and the acceptable uncertainty in the results. Studying convergence requires choosing an appropriate mesh refinement metric.This website uses cookies to function and to improve your experience.

By continuing to use our site, you agree to our use of cookies. The information provided may be out of date. Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

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OK Learn More. Discussion Forum. Forum Home. New Discussion. Is comsol v 4. Send Private Message Flag post as spam. Please login with a confirmed email address before reporting spam.

Send a report to the moderators. Hi I am simulating plate with surface crack in comsol,but I am not able to get proper meshing in comsol. Is it possible?? Hi import of Nastan Neutral files are possible for the meshed geometry but it gives you quite some work to regenerate a geometry and apply correct physics and BC as these are NOT applied to the mesh, but on the geometrical entities.

The COMSOL mesh is generated therefter from the entities and the mesh heritates its properties from the domains and boundaries it bolongs to. I find the mesher quite usefull, you need to learn it's way but you have many options.

HAve you run the meshing video? As i know it will not work. Is it possible to do mapped meshing in my case. Hi and what's wrong with a dense teth? How to remove these inverted mesh error? Hi first of all, as I said a warning is not the end of the story, mostly the results remain valid.

THe inversion of a mesh means that the shape is becoming too elongated sothat the higher order shape functions do not correctly model the mesh element. Hence COMSOl turns to 1st order meshing elements, where the elements are risky to be "inbverted" The cause being the distorted shape, and this is related to mesh initial size aqnd total deformation, including how this deformation is distributed among the different mesh elements image these as a series of springs with masses in betwee, If all masses, and spring stiffness are the same, then a compression of your strudcture is evenly distributed.

But if you have larger and smaller masses, with larger an smaller springs, then the deformation might become so irregular that the large stiff elements completely sqeezes the smaller softer adjacent ones. In the solver setting you have a few "spring" smoothing models "Wilslow" and "Laplace" I believe, in V4 we have also "hyperelastic", not sure it's there in v3.

These you can also play with Finally if you knoe a little how the mesh deforms tears in your case you could try to draw some helping edges and impose a regular deformation along these -- Good luck Ivar.

Log Out.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Computational Science Stack Exchange is a question and answer site for scientists using computers to solve scientific problems.

It only takes a minute to sign up. This might be a question better suited for the Software Recommendations side of S. I am looking for a free not only as in freedom alternative to Comsol Multiphysics. Here is the tricky bit: I am not simply looking for a modelling and simulation package, of which there are loads, rather I am looking for a free solution that has as similar syntax to Comsol as possible.

Maybe there is some package you can run together with Octave? If so, I haven't found it. Any help will be greatly appreciated! Fluids flowing between various containers, heat conduction, ect. Simulating solutions to various PDE's in short. The main functionality I am looking for the other software to parrot is Comsols Model Wizard.

Cracked rust 2020I had the same question a couple of years ago and I listed all Finite-element, Multi-physics framework. As you may know there are many of them. They have nice Python interface which makes things easier.

In your case there are tutorials of coupling fluid flow with heat transfer, for example:. Sign up to join this community.

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**How to Convert an Imported Mesh to a Geometry in COMSOL Multiphysics**

Home Questions Tags Users Unanswered. Alternatives to Comsol Multiphysics Ask Question. Asked 5 years, 4 months ago. Active 2 years, 7 months ago. Viewed 13k times. Thank you! Vocor V. Vocor 1 1 gold badge 1 1 silver badge 6 6 bronze badges. Vocor, and welcome to scicomp!This website uses cookies to function and to improve your experience.

By continuing to use our site, you agree to our use of cookies. Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' or the latest version listed if standards is not an option.

North America. Log Out Log In Contact. OK Learn More. Discussion Forum.

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Forum Home. New Discussion. Send Private Message Flag post as spam. Please login with a confirmed email address before reporting spam. Send a report to the moderators. Hello everyone! I have simulated a laminar flow in an annulus using direct solvers.

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The results match well with the problem taken from Bird Stewart Lightfoot. I am trying to observe if changing the solver I have used will bring about any change in simulation time, easier convergence,etc. However, I am not sure where to look for these details. Could you help me find where any changes, due to changing solvers, may be possible? It shouldn't be there, right?

I have read that the solution is generated 'at once' using direct solvers using matrix method. Thank you for your time.

Navier-Stokes is a nonlinear problem per se. As such a nonlinear method is used around each linear step.

That is the convergence progress you see in the graph. Niklas Hello everyone!You seem to have CSS turned off. Please don't fill out this field. Please provide the ad click URL, if possible:. Help Join Login. Operations Management. IT Management. Project Management. Services Business VoIP. Resources Blog Articles Deals. Menu Help Create Join Login. HyperWorks vs. Learn More Update Features. Add To Compare. Business Hours. No images available.

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