How to use interpolated material data to model irregular geometries. Use an interpolation function in an analytic function. The properties are analytic functions over a given interval of the argument. The interpolation functions were dependent on spatial coordinates r and z. Use functions to define a material property comsol multiphysics. The derivate of an interpolation function is defined automatically. An interpolation function is defined by a table or file containing the values of the function in discrete points. Curl function for 3d data using meshgrid and interpolation. Comsol multiphysics 3 the global variable numberofdofs reports the total number of degrees of freedom dofs in the model, including any internal dofs in the solver. I have defined h as a time dependent interpolation function under global definitions. For example, make a function out of the m file which takes a file name as a parameter.
To conduct the analysis we assume a displacement model to approximately indicate the variations of the displacement within the element. A mechanical simulation of a wrench computing the effective stress and deformation simulation of fluid flow and chemical transport in a micromixer. When comsol multiphysics evaluates the function, the software performs a structured interpolation from the data values on the grid to the coordinates where the function is evaluated. See the model rock fracture flow in the comsol multiphysics model library for an example using data interpolation. Using interpolated function to model space dependent material property why does comsol. I do not have an explicit function for conductivity as a function of temperature and electric field, but rather a set points of experimental data for a range of electric field and temperature values. Comsol multiphysics provides the solution at that time using interpolation. Interpolation software free download interpolation top. Interpolation function import is faster, more memory efficient, and robust if the data is stored in structured grid format. How to define an interpolation function in comsol using. I was trying to use the interpolation function and use it it the heat source.
Use functions to define a material property comsol. As a new comsol user, i am currently trying to run a simulation of an ar plasma. Curl function for 3d data using meshgrid and interpolation function. Following your suggestion, i defined an interpolationbased function ft,x, however, i encountered some fatal errors and comsol stopped working. The comsol discussion forum covers a wide variety of simulation topics.
Interpolation returns an interpolatingfunction object, which can be used like any other pure function the interpolating function returned by interpolation data is set up so as to agree with data at every point explicitly specified in data the function values f i can be real or complex numbers, or arbitrary symbolic expressions the f i can be lists or arrays of any dimension. Using interpolated function to model space dependent. Boundary element method for acoustics and electromagnetics. I am not sure whether the independent variable t in comsol is time for interpolation or i can use any term for example plot specific heat vs temperature. You may want to check out more software for mac, such as mass update anything, funny status updates for facebook or tolis group update utility, which might be similar to comsol update. An electrical simulation of a pacemaker electrode with computed voltage and current distribution the comsol desktop is a powerful integrated user. Top 4 download periodically updates software information of interpolation full versions from the publishers, but some information may be slightly outofdate using warez version, crack, warez passwords, patches, serial numbers, registration codes, key generator, pirate key, keymaker or keygen for interpolation license key is illegal. How to specify material properties with functions in comsol. In comsol multiphysics, you can indirectly define irregular shapes. This functionality has been available in previous versions of comsol multiphysics and, in version 5. Comsol is the developer of comsol multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems.
The documentation set for comsol script consists of the following volumes. Cp as a function of t is accepted under the particular material properties. A warning is now issued if you use a reserved name for a builtin function such as. The goal is to import material data into interpolation functions that we. If we can figure this out you should be able to create an interpolating function. Fourier interpolation, is a resampling technique where a signal is converted to the frequency domain, padded with zeros and then reconverted to the time domain. Comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the technical support team. The grid is defined by the pdata matrix with ncolumns and nrows the output value is a value of the source matrix grid s that is closest to the point x s, y s. This is a native format of comsol multiphysics in which the text file is organized to format one section with coordinates, one with the element connectivity, and one with data columns. When you have your comsol model saved as an m file, you can change the interpolation function as you wish. Interpolatingfunctionwolfram language documentation.
Comsol quick installation guidebasic information for installing the comsol software and getting started. We create one interpolation function per data column in the file and add the units for the arguments as well as the function itself so that the units are correctly recognized in the physics. Comsol nearest neighbor interpolation of the normalized array power density. When all data columns have the same unit, it is possible to create all functions within the same interpolation feature.
I am trying to understand if, given an interpolation function defined by a table of points in an external file like. The functions plot correctly, showing a very oklooking curve representing the rate coefficient in function of the electron energy. Please login with a confirmed email address before reporting spam hi, i have read so many posts about this problem but still cant seem. Comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from. In comsol multiphysics, you can use interpolation, analytic, and piecewise functions to specify a material property. Comsol multiphysics also has several problemsolving benefits. Using options functions i defined a function named velocitye. For functions of more than one variable comsol multiphysics supports only. The polynomial chosen to interpolate the field variables over the element are called shape functions. I have extracted a data set from comsol software which consists of coordinates, x y z,in mm and velocity u v w, in ms. How to specify material properties with functions in. The import functionality automatically detects if the data is structured or unstructured. Introduction to comsol multiphysics pdf recommend documents. It would be nice to enter these points in comsol and have it do some cubic interpolation of the 3d plane x temperature, y electric field, z.
Browse the threads and share your ideas with the comsol community. In fea we discretize the solution region into finite elements. I also meet the problem in using comsol multiphysics. I have defined an interpolation function tt for a temperature profile.
My problem is very simple so that i used the pde coefficient form directly. This file is then used in an interpolation function in the applications. Parameters, functions, variables, and model couplings. How to use interpolated material data to model irregular. Shape functions or interpolation functions civildigital. To be able to import a text file in the interpolation curve feature, the coordinates need to be organized in the sectionwise format. Either comsol does not export the true computation mesh or the solution does not match to the mesh. From that, can i conclude that comsol is using the coordinates along the. The input data used for the interpolation function was a velocity distribution exported from a previous solution surface. As no other possibility is available, the data exchange of vectors and matrices from matlab to comsol is handled in a somewhat cumbersome manner. If x is a vector then x is resampled with n points.
How to interpolate through space x and time comsol data. The quantities, calculated in the sequence controller, for example, velocity distribution, are written into a text file and read by the comsol interpolation functions. We have strived to achieve backward compatibility with the previous version and to include all functionality that is available there. Does anyone have any ideas on the code behind rotati. To switch easily between some different conditions i wanted for, i defined some interpolation functions from tables. Follow 3 views last 30 days israr ahmad on 3 aug 2018. Shown is the fluid velocity field and species concentration. How to define an interpolation function in comsol using matlab.
You can define an analytic, interpolation, or piecewise function to describe any material property in comsol multiphysics. Ill present this question in degrees purely for simplicity, radians, degrees, different zerobearing, the problem is essentially the same. I am sure there is a setting in comsol to make the mesh and the solution be in sync. So, im trying to enter cpspecific heat as a function of two variablestemperature and magnetic field. In a 3d component, you specify interpolation functions under the definitions node by supplying sample function values for a point set. The remaining elements are indicated by domain specifies the domain of the data from which the interpolatingfunction was constructed.
Mollier diagram eindhoven university of technology research portal. An interpolation function is defined by a table or file containing the. You can now generate a tetrahedral mesh directly from an imported surface mesh, that is. Comsol multiphysics makes use of smoothing to interpolate the values of the. This function applies bilinear interpolation to find an intermediate point d x s, y s by the specified coordinates x s, y s between 2dimensional grid points using linear polynomials. It is now possible to plot the inverse function in addition to plotting the function itself for interpolation functions that you define. Interpolation function define in material list read. Now i need to solve a similar problem, but in which case the interpolation functions are dependent on dependent variables. In the comsol multiphysics software, you can use interpolation, analytic, and piecewise functions to specify a material property interpolation functions can be used to describe material properties that are defined by a table or file containing values of the function at discrete points. When all data columns have the same unit, it is possible to create.
Interpolatingfunction works like function interpolatingfunction x finds the value of an approximate function with a particular argument x in standard output format, only the domain element of an interpolatingfunction object is printed explicitly. But when i enter cpt,h it turns orange and says h is an unknown variable. When i disable the interpolation function, comsol successfully solves the model. Though it hasnt been long since its spring release, comsol has not only sped up its platform, it has also added new electromagnetics, acoustics and. Fixed crash that could occur when using incomplete lu preconditioner.