You can edit the global variable by double clicking the dimensions and using the Modify dialog box, or by editing the values in the Equations dialog box. Global variables are bi-directional, meaning that if two or more dimensions are defined in terms of a global variable, then changing any one of the dimensions will cause the others to change.
You can use an integration coupling variable applied to the point at which you want to evaluate the position, velocity, etc. (and I'm assuming any other variable) and just make sure the "Global Destination" checkbox is marked. That way it is available as a global variable to plot in your output file from the parametric sweep. How to make "time step to store output" variable in Comsol Multiphysics? In time dependent study one can define the range like (0,0.1,1) the solver stores solution at each 0.1 interval. 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. † It is now possible to plot the inverse function in addition to plotting the function itself for interpolation functions that you define. Aug 10, 2017 · In the COMSOL Multiphysics® software, you can add a second y-axis to a graph to show both quantities at once. In this video, we go through the simple steps of including a second y-axis for one graph.
If you provide a description, COMSOL uses that and it appears among the other expressions in alphabetical order; otherwise the variable name appears within parentheses. For plots that take vector inputs you must use the defined variables directly in the edit fields for the vector components. Mar 22, 2011 · If the definition of myVar*t means "a constant times the time t" you can define it directly as Global Variable, where "t" is a predefined variable for time. If you define it as analytic function, you can call it with "t" for time or any other input argument. Best regards, Magnus Ringh, COMSOL
Apr 05, 2010 · I can use the DC term as V*S in the external desnity expression window but I cannot seem to figure out how to introduce dV/dt where V(t), the voltage, is the state variable that COMSOL is solving. I can't write C*dV(t)/dt. How can I draw point graph in COMSOL? ... . the speed and displacement of the plate is calculated by Global Equation (ge). ... I am trying to add this variable as a function of T in COMSOL>Model ...