Inconsistent Units
Hi, I´m trying to incorporate the following expression on Subdomain expressions: D=0.926*T^2.5/(T*245) the result should be in mm^2/s, but It shows me "Inconsistent Units" even when I try the...
View ArticleInterpolation Function Help
Good Morning, I'm having trouble using COMSOL's interpolation function, and I was hoping someone might be able to help. I'm trying to load data from a tab-delimited text file. I've followed the...
View ArticleRayleigh-Plesset bubble response
Hello everybody, I try to model an micro air bubble in water under an incident ultrasonic pressure field. In near future I hope to be able to add walls to the system, therefore I need a model which...
View Articleline integration of scalar field for use in study, not as result
hello, i am having great difficulty figuring out how to use a line integral inside of a study. for example, i am seeking to use the line integral of a temperature field (1st interface) across a line in...
View ArticleHow to plot two or more independent vaiables in one plot?
Hi, I am solving some PDEs and I want to plot 2 or more independent variables in one plot. how can I do this?
View Articlepzt deformed
Dear Comsol, I'd like to calculate the volume formed by pzt to be deformed, when applying a DC voltage. How can I make this calculation in comsol ? Thanks
View ArticleCapacitance as a function of frequency plot
As the subject, I would like to know how to make plot of Capacitance vs Frequency. I am using AC/DC module and electrostatics study.. moreover, i have computed using stationary step to plot the...
View Articlecomplete elliptic integral
Hello everybody, I need to compute the complete elliptic integral of first kind and of second kind in a complex Comsol model. I didn't find these functions in the mathematical functions page of the...
View Articledeformed mesh
I'm using moving mesh analysis and piezo solid for simulating a piezoelectric cantilever .. I’m able to get the results only when I use the physics separately. If I combined both the physics and tried...
View ArticleConvection between to domains
Dear reader, I am trying to setup a convection between two domains. An issue I have is that the boundary condition "convective cooling", defines the external temperature (or environment temperature) as...
View Articlecalculating magnetization?
Hi, In Comsol 3.5, I was able to calculate the magnetic moment for an object (in the model below, a sphere) with a constitutive relation B=mu0 mur H, when embedded in a bigger block with B=mu0 H, (ie...
View Articlereacf
I have not found the mathematical formula for the "reacf" operator. What is it? Another issue: When I integrate "Current density norm" = ec.normJ or reacf(V) over an insulating surface, I get a nonzero...
View ArticleParameter Estimations by Inverse Analysis using Comsol 4.2.
Dear Sirs, I would like to have an opinion by more expert users than me. I am facing a problem of parameter estimation by inverse analysis for structural mechanics. More simply, I have to estimate the...
View ArticleNumber of degrees of freedom solved for: 96195
Dear Sirs, I am trying to understand from where the number 96195 comes from. In particular, the mesh I am considering is a tetraedral mesh of a rectangular domain in 3D ( width = 5 cm, depth = 1.5 cm,...
View ArticleModal Mass calculation
Hi Is it possible to calculate the modal mass for a particular mode shape? Can someone please explain how to do it.
View ArticleTime Integral in Frequency Domain
Dear All, I have got a simple geometry: a 1mm thick piston-disc is vibrating with a frequency of 1kHz at 1cm above the closed bottom of a (L=353mm long, Rc=38mm radius) cylinder. The maximum...
View Articlewhat is COMSOL plotting when I surface plot a complex quantity in time...
I'm new to time harmonic analysis. I guess the answer to this question is obvious to many of you that are familiar with time harmonic analysis. I am doing a 2D time harmonic simulation of a...
View ArticleHelp Needed: Comsol solving Error
Hi I am new to Comsol Multiphysics 4.2a. I built a model & try to run it but after clicking compute and it gave me an error specifying the following feature has encountered a problem: -Feature:...
View ArticleWeakly compressible Navier-Stokes Equation
Can Acoustic module be used with Weakly compressible Navier-Stokes equation module to simulate the plate's natural frequency due to sound wave under fluid flowing over it?
View ArticleHow to apply ac voltage
Hi all I want to apply ac voltage(using piezoelectric excitation) to an accelerometer to perform transient analysis. I have tried the SPICE circuit editor, but it supplies only dc voltage. Is there any...
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