Will integrate the x-component of the electric field on the line. And for Cp, I have defined it as an interpolation function depending on 2 arguments (temp and mag. I have defined H as a time dependent interpolation function under Global Definitions. But when I enter 'Cp (T,H)' it turns orange and says H is an unknown variable. You can also combine this with the Analytic function you defined earlier: Cp as a function of T is accepted under the particular material properties. For example, if you add an Integration operator called intop1 and select a line, the expression Keisoku Engineering System Co., Ltd., 195 Uchikanda, Chiyodaku, Tokyo 1010047, Japan. I put some pics in the attach to show you. But if I click the node pg1 (Plotgroup), then it didn't refresh my results-plot. (x-Range: now 300-1600K) If i hit plot, it visualize the right plot in the graphics window. Now, i change the data in the interpolation function (int1) with another data-file. If you want to integrate a space-dependent expression (such as es.Ex) on a line or a boundary, you need to use an Integration coupling operator (again under the Definitions node). The plot created then in a new Plotgroup (pg1). In this respect, it's better if you use another name for the dummy variable to avoid confusion. You simply get es.Ex*(x_b-x_a) since es.Ex is a constant with respect to the dummy integration variable x.
Note that x is a "dummy" integration variable, not the x-coordinate, so if you write
When you call the function in question, you can pass to it any variable you need. The integrate operator numerically integrates any function with respect to a variable:īut this assumes that there is a function with name E defined e.g. Hello, In the window where you define an interpolation function, the letter 't' is just the name of the argument of that function. For example, if you called your function f, you can use f(x) anywhere, where x is the argument to your function.
Comsol 5.1 interpolation function how to#
This video shows you how to create each of these function types for any material property you want.You can define a function with an analytic expression (such as x^2+4) as an Analytic function under the Definitions node, and then use it anywhere in COMSOL as a function. 5 1 Introduction W elcome to the Material Library, an add-on product that provides predefined material data, primarily as piecewise polynomial functions of temperature. You can enter the start and end points for each interval and the function relevant to each interval, as well as choose the interpolation and extrapolation methods. Posted, 12:48 GMT-4 Fluid, Heat Transfer & Phase Change, Heat Transfer & Phase Change Version 4. Please login with a confirmed email address before reporting spam. How can I solve the problem Or should I use Variables Thanks. Now, this time COMSOL can not recognize the interpolation function f. Now I want to define a function for a heatsource: Q const (T(t) - T0) If I try to modulate that function as an analytic function, COMSOL doesn´t recognice T(t). Piecewise Functions are useful for describing a material property that has different definitions on different intervals. I have defined an interpolation function T(t) for a temperature profile. Then, enter the arguments to the function and specify the value range for each argument.
First, enter the mathematical expression that defines the function. I wish to create an interpolation function of experimental time-course data using the (Options->Function) tool. Then, specify the function behavior between data points and outside of your range of data.Īnalytic Functions are used to specify material properties as functions of one or more arguments, or as independent variables, such as temperature or pressure. I have a 1D domain and have written my PDEs using the transient diffusion mode from the model navigator. Dear all, Im encountering problems when using the Interpolation functions. Define random function feature defines a random function that samples from a probability distribution specified by the interpolation function.
For example, make a function out of the M file which takes a file name as a parameter. Either enter the data manually or import it from a data file. EST AC/DC & Electromagnetics Version 5.1 2 Replies. When you have your COMSOL model saved as an M file, you can change the interpolation function as you wish. 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. In COMSOL Multiphysics, you can use Interpolation, Analytic, and Piecewise Functions to specify a material property.
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