Magnetostatic force on tiny mass objects - hitting machine precision
Hi I have a study where I am looking at the magnetostatic force on a tiny object and the dimensions are such that I am hitting the machine precision in the force but the mass of the object is orders of...
View Articleshear stress sign convention in comsol
Does anyone know what sign convention for shear stress follows in COMSOL? It seems it does not follow the elasticity sign convention for shear stress.
View ArticleError during time dependent study
Hey can u guide me that which study i should carry out for voltage induction from a rectangular beam of magnet to a simple coil? What I am trying is moving mesh, solid mechanics for fixing one side of...
View ArticleLaplace-Beltrami Operator on a Curved Surface
Hi all, When I use the Coefficient Form Boundary PDE (cb) on a curved surface, is differential nabla operator the generalized operator which implies the curvature, say, is the Laplace operator the...
View ArticleCombining pysics
Hey. I want to ask if there are any settings in COMSOL-e, when combining both effects of multiple physics into one calculation. For example, electric currents and laser heating in one componente behave...
View ArticleMy biggest wish for X-mas: Solution for crack modeling
Dear Comsol gurus, dear support, my biggest wish for X-mas was, that the new 4.4 release would finally provide some reasonable approach for crack modeling as being standard in other software packages....
View ArticleUsing simulated potential to simulate magnetic field.
I have a simple 5 domain model, composed of roughly concentric spheres. I am modeling a transmembrane potential on the 3rd domain using the General Form PDE physics. This part is working correctly. I...
View Articlehow can we define laser (mathematical equation)
I want model a laser,I have done the problem as rectangular pulse, but I want to define it as Gaussian I am happy to a reply
View ArticleComsol 4.3b_ Heat Transfer Module
I am doing simulation with Heat transfer module/Joule heating and I get the convergence error of " Failed to find a solution. Divergence of the linear iterations. There was an error message from the...
View ArticleApply harmonic normal stress (traction)and shear stress (traction) at boundary
Hello everyone, I need to apply harmonic normal stress and shear stress at a boundary as excitation. Does anyone know how to perform it in comsol? I know we can apply prescribed displacement or force...
View Articlegiving electrical potential to an array of points in sequence
Hello, I want to give electrical potential to an array of points in sequence. I think I should do this by using time dependent study but I still could not achieve. Is there any idea about this problem?...
View Articlereg bicycle dynamo
hi,i am doing m tech and i am doing project on renewable energy source in which i am using Bicycle Dynamo(bottle type) so the thing is that can i simulate the characteristics of bicycle dynamo in...
View Articlemesh
oh.. hay.. I am a new person to learn about software COMSOL. There are parameters that I have not know its function. Here I use the option for 3D dimension space by using module AC / DC-static,...
View ArticleUnhelping Blog
Sorry to say but I found people here are very unhelping, even though they have a lot of expertise but even then they don't bother to help others. Knowledge is something that should be spread, not the...
View Articleabout solving
thank a lot for my last question the answered.. and now i will ask again about solving... there are many menu in solving.. and what the meaning about in submenu 'solve parameter' thare are...
View ArticleHow to Couple Free and Porous Media Flow with Heat Transfer In Solids
Hi Everyone, I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell),...
View Article32 bit system PARDISO does not work while solving Navier Stokes equations
I have a Windows 7 , 32-bit system with 4 GB RAM and I am simulating the rotational benchmark model using COMSOL 4.3a with Update 2. The degrees of freedom of my system is a little more than 70,000. I...
View Article32 bit system PARDISO does not work while solving Navier Stokes equations
I have a Windows 7 , 32-bit system with 4 GB RAM and I am simulating the rotational benchmark model using COMSOL 4.3a with Update 2. The degrees of freedom of my system is a little more than 70,000. I...
View Article32 bit system PARDISO does not work while solving Navier Stokes equations
I have a Windows 7 , 32-bit system with 4 GB RAM and I am simulating the rotational benchmark model using COMSOL 4.3a with Update 2. The degrees of freedom of my system is a little more than 70,000. I...
View ArticleError in Two Phase Flow
I am using the Level Set Method in Comsol. When I am using the Time dependent solvers I get the following error- Failed to find consistent initial values. Last time step is not converged. The same...
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