modeling sessile droplet evaporation
Dear Firends, does any one has experience with modeling phase change from liquid to gas ? is there exists any tutorial ? I intended to model evaporation of single droplet pinned of relatively hot...
View ArticleAnimation Scale Factor
I'm trying to create an animation of my simulation. Every time I create it (under Report > Animation), the scale factor is reactivated to some arbitrary value EVEN if I deselect it or specifically...
View ArticleHeat transfer simulation result is much larger than experimental result
I modelled the heat transfer through a hollow brick to calculate the equivalent thermal conductivity. So general heat transfer and weakly compressible Navier-Stokes modules were taken to build the...
View ArticleSome comments on pA material absolute pressure and CFD gauge & reference...
For those interested in pressure definitions As I read often comments on the Forum, and I heard many questions on the last workshop at the Milan conference on CFD pressure, gauge, absolute, reference...
View ArticleMagnetic field
Does anybody know how to write this expression on comsol ( ∇/B/^2 )? I meant expression that replace "the gradient of the magnetic field norm square". Thank you
View ArticleLocal Edge System
Hello, I'm trying to implement a "Predescribed Displacement" Condition on an Edge using the local Edge Coordinate system. But i have the Problem that i couldn't find a reference to the "Local Edge...
View Article2D Power Density
Good Afternoon, I am having some trouble calculating what my power density should be in my 2-D model. I am modeling a cross sectional cut of a heated aluminum plate in air. In my experimental runs, the...
View ArticleHow to write Nabla function in comsol 3.4
Hello, Can anyone tell me how to write nabla function in comsol 3.4? What is the syntax for this function? I wanna use it for dielectrophoresis and there is a term where I need to find the gradient of...
View ArticleDefining a Piecewise function of two variables
Hello, I am trying to model NMR diffusion in COMSOL 4.3 and need to define a function beta at three different time intervals as follows: beta = gyro*(g*x) (0 < t < 0.016s) beta = 0 (0.016s < t...
View ArticleHow to generate a "Join Data" set from parametric steps?
How to generate a "Join Data" set from two stationary and parametric steps? Hello everybody. Does anyone know how to merge two solutions when one of them is the continuation of the other? For instance,...
View ArticleSimulation of the magnetic fied
Hi, I have one physical NdFeB magnet and I need to simulate this magnet in Comsol 4.2a, but I dont know exactly how to do it. I know these parameters of the magnet: Remanence Br = 1380 mT Coercivity...
View ArticlePlease help me find how to achieve this function.
It seems to be a simple problem but I can't figure out how to make it. Description: a 2d transient model of a square is built, the left, bottom, and right side is thermal insulation and the top side is...
View ArticleLine maximum: tabulating data
I need to take a series of line maximums (for Temperature, say) from a regular array of parallel lines which are perpendicular to the y-z plane and pass through a bounding box in 3D space. The line...
View ArticleMaxwell stress tensor integration
Hi everyone! I'm still trying to compare the electrostatic force calculated by the expression (F=0.5*epsilon*V^2*A/g^2) with the result coming by Maxwell stress tensor in COMSOL. I used the suggestion...
View ArticlePlease help! (error: Undefined value found)
Hello everyone, I’m working on the following model from Comsol library: Batteries and fuel cells>>ht_pem. When I change the geometry to a more complex one, for example using two or three...
View ArticleEigen-frequency analysis of metal grating
Dear all, For a metal grating (see attached Structure_Reference.jpg), now I would like to analysis the dispersion relationship of surface plasmon wave supported by a metal grating, which propagates...
View ArticleMie Scattering problem, Csmcol 4.2a
Dear Fellows, I want to find module about "Mie Scattering", but I can not access to this module.www.comsol.com/showroom/gallery/3459/ Is that module still exist in the gallery or not? Thank you for...
View ArticleHeat Transfer in Soils
Hi, I am a comsol user and I want to have a 2d axisymmetric model. In my model, I have a soil sample that I put a steel bar in the soil. I want to heat the steel bar with a constant temperature 500(k)...
View ArticleHow to change equation during a transient solution in V4.3
Hello everybody, I am simulating a transient solution by using transport of dilute species. I would like to change the equation during a transient solution and use the initial value of simulation 2...
View ArticleThermal Conductivity as a function of temperature
Hi all, I am trying to include thermal conductivity as a function of temperature in my model but its giving me error 'inconsistent unit'..let us say the function is -1.27E-9*(T)^3+8.09E-6*(T)^2-...
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