- the parameter line that calcualtes out your value (and translates the units) if(T==300 && y == 0,xi == x) See the COMSOL Multiphysics User's Guide and the following Knowledge Base entry for details: Best Regards, This is done from Definitions > Model Couplings. Your internet explorer is in compatibility mode and may not be displaying the website correctly. It said the expression is if(cond, expr1, expr2), I am not sure whether expr2 is necessary or not. - Variable: mod1.p Alwaysmverify and validate your work,in steps it's easier ;) COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH), www.comsol.com/support/knowledgebase/905/, Reducing the amount of solution data stored in a model, Visualization for 2D Axisymmetric Electromagnetics Models. then what about: To add to Jeff's reply, COMSOL Multiphysics includes units for hour, day, and year, so you can use, for example, To add to Jeff's reply, COMSOL Multiphysics includes units for hour, day, and year, so you can use, for example, Ivar, Are there any way to make a 2D function? Best, You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version say, integrating an field-expression within bounds of (x1,,y1) and (x,y) in a 2d model (x10, f(t), 0) Jeff. My intention is to plot a 2D Model where only a part is shown coloured. I tried the following expression with no success: Posted Apr 23, 2015, 1:54 a.m. GMT+2 An example: For example, x>2[cm] filters the plot to only include the part of the geometry where x > 2 cm. you need to separate each condition and multiply them, i.e. if ( (x, [QUOTE] Hi, Operators, including the up and down operators, are documented in the COMSOL Multiphysics Reference Manual. After I would created another one with a conditional statement: I am using the d operator but it isnt working for me. Am I right? Then use the sections below to specify the geometric entities to split, the expression, and the split condition. if ( (x, [QUOTE] Now all you need to do is enter sqrt(0.5*(tresca_smld^2+mises_smld^2)) in any of the Expression fields and click OK to see your new stress distribution. Results-Derived Values-Surface Integration, set Expression equal to 1 to get the full area, and Expression equal to (u>1.5) to find the area where u is larger than 1.5. Use the imag operator to show its imaginary part, abs to plot the norm, or arg to see the phase angle. I didn't tested it, but it seems that it would work. listed if standards is not an option). I want to calculate the value of the x coordinate when y = 0 and T=300. -- Good luck I think I've found a solution to my problem, although I'm not using it anymore in my simulation. where the last two expressions both evaluate to the number of seconds in an astronomical year (31557600 s). To my opinion above expression should be intop1(u*(x2>x>x1)*(y16), which evaluates to 0 for simulation times up to 6 seconds and to 5 after 6 seconds. How to Create High-Quality Model Images in COMSOL Multiphysics, Developing a Silicon MEMS Chip for On-Demand DNA Synthesis, Predictive Analytics Capabilities of SmartUQ for COMSOL. I have a simple bi-metal assembly. i = -(h>100) Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. For instance, Hi This is handy if you want to see changes over a time interval. 22 Replies, Please login with a confirmed email address before reporting spam. COMSOL offers a whole range of useful ones, not all equally obvious. -- - the analytical function, whcih allows you quickly to plot a function. Suppose you have an integration operator intop1 and an expression u that you want to integrate over the rectangle x1Built-In Operators. Hi Randhir, of 2 [mm] * 3 [mm], but not along the two edges at x=2 and y=3. listed if standards is not an option). In the COMSOL Multiphysics software, using Boolean and adjacent selections, you can create customized groups of geometric entities that update automatically when you change your model geometry. I hope this helps. I am trying to use an if statement to get the value I want but keep getting a value of 0 for xi: Thanks in advance. -- Cite 15th Feb, 2018. In my case, I'm trying to type a cosine function to simulate solar radiation throghout a year, with daily and annual variation. The expression to evaluate then becomes intop1(u*(x>x1)*(xy1)*(y1) works well for many cases meaning V=V0 for X<= 1 and V=V0+V1 above>>, Regarding the above statement, I don't see how this syntax communicates that V=V0 for X 100, then i = -1, if not i = 0, Hi -Adam, Hi Version 5.2a COMSOL Multiphysics provides smoothing functions that you can use to make, for example, smooth step functions that are continuous. Can anyone give an advice on how to implement a conditional statement with two arguments? If not, please contact support@comsol.com with your model, and we should be able to give you some more specific advice. Another handy pair of operators is up and down. cannot suggest more like taht ;) Discontinuous functions like the step function above might cause numerical difficulties. Ivar, Hi Ivar, Each solution comes from one step function. Plotting the expression at(20,p)-at(10,p) overrides the Solution at time setting and shows you the pressure increase between 10 and 20 seconds. Magnus Ringh, COMSOL. Discussion Closed This discussion was created more than 6 months ago and has been closed.

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