Falling ball
Hi, I am trying to simulate a falling ball inside a fluid, this is for simulate a falling ball viscometer. I'm working in transient mode, with the sphere like "sliding wall" and the tube like "no...
View ArticleUsing Continuation to optimize a value
Hello folks, I am wondering if it is possible to use the Continuation feature in the solver to optimize a value. For instance, have a flow in a pipe and using some data like pressure drop, velocity,...
View ArticleHow to change mouse controls
Is there a way to change the default mouse controls for the model viewing window? I use Solidworks extensively and am very used to pressing mouse3 to rotate the model and the scroll wheel to zoom....
View ArticleLaminar and turbulent flow in pipes
Hi All, I am trying to model fluid flow and heat transfer in a pipe for different fluid velocities. for Reynolds numbers < 2300 I use navier-stokes equations for laminar flow and for Re>2300 I...
View ArticleWeak form PDE of Comsol
Hi, What does the weak expression mean in Comsol? I am very curious about the theoretical background of the development of the software. I would be appreciated if someone could send me some refence on...
View ArticleHow to model a flow with 3 different fluids?
Hi, Is it possible to model a flow with three different fluids. Say oil drops and gas bubbles in a container filled with water? The two-phase interface and the bubbly flow interface only allow for two...
View ArticleBubble not rising in Rising Bubble model
Hi, I am trying to simulate the rising bubble example given in Comsol documentation in Comsol 4.3. Basically, I have a similar problem with different fluids and different dimension scales. So...
View Articleproblem in view
Dear all , I created a two coil system , primary with six number of turns and secondary with one turn , primary place at 0.4 m and secondary placed at 0.38 m , when i simulated before it is showing the...
View Articlehigh mach number flow with k-omega turbulenz model
Hi, I need to simulate a rotor. because of the speed of the fluid (0,4<Ma<1,3), it's necessary to use the physics "high mach number flow". In that case, Comsol seems to offer just the turbulenz...
View ArticleRemeshing a Deformed Mesh in 4.0a
Hi, I am simulating the heat transfer in biological tissue that has been compressed. First I apply a gravitational load, and next I want to run the heat transfer calculations on the deformed geometry....
View ArticleParasitic capacitance of inductor
Hi! How can one calculate parasitic capacitance of inductor? Is it possible in 2d axisymmetric case? I can't find any situable example. P.S. I use AC/DC Module to model inductor. Thank you!
View ArticleError in solver
hi, I am modelling a 3d accelerometer in 4.2a version, during simulation i m getting an error like "out of memory during LU factorization" , could anyone pls tel me why i am gettin dis error..
View ArticleSwitched reluctance motor - rotor and stator deformation - How?
Hi. I am building a 2D model in which I would like to showcase how the stator and especially the rotor of a switched reluctance motor deforms because of the radial and tangential magnetic force on the...
View ArticleError Message "String index out of range: 66"
Hi Everyone, I'm wondering if anyone has ever gotten this message in Comsol and what exactly it means (I'm using version 4.3). I'm getting the error message when I try to run a parametric sweep. I'm...
View ArticleDefining heat source correctly
I am busy modeling batteries that heat up during use, and an airflow over the batteries to cool them. Each battery produces 12W of heat, according to the manufacturer. I have simulated it as a 2D...
View ArticleSlip and No Slip
What is the difference between slip and no slip options in the boundary conditions of laminar flow. which will be a suitable option to choose for blood flow in capillaries.
View ArticleImplimentation of equatuion
Hi, I want to implement "my own" physics into Comsol or change a physic. How can I do that? Thanks!
View Articlecoil voltage
Hi. I'm really new to COMSOL Multiphysics and I think I need some help. I have a coil and inside it an oscillating magnetized ribbon. I try to calculate the voltage induced in the coil by the magnetic...
View ArticleStarting simulations automatically via waiting list
Hi, does someone know if it's possible to start more than one simulation at once? Is there something like a waiting list on which I can put different models and then Comsol starts the second job...
View ArticleAccess to a function value in matlab
Hi, I am running a comsol model through matlab. This comsol model has a function El(t) that returns an output based on the value of t. I would like to have the results of this function stored in a...
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