Weak 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 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 ArticleGraybody Radiation
Hi I am trying to model radiation between two parallel surfaces in the heat transfer with surface-to-surface radiation physics. I am currently using surface-to-surface radiation with user defined...
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 ArticleConjugate Heat Transfer
Hello! I am an undergraduate student working in my hands on project. I am a beginner in this software but basically what I would like to work on, is in a simulation involving heat transfer and fluid...
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 ArticleMagnetic force imposing on magnetic fluid in 3D magnetostatic field (no...
Hi Everyone I try to do with a simulation of magnetic fluid imposed on magnetic force in magnetostatic field (no currents), but the results show that there seems to be no magnetic force on magnetic...
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 ArticleWhat is the difference between boundary and domain when assigning materials?
Hi, I'm new to comsol and the answer maybe obvious to some of you, but here's my situation. I want to design a piezoresistive sensor. In the model library, there is a similar sensor example where the...
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 ArticleSimulation error
Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...
View ArticleCFD from stationary to time dipendent
I built a model of pipe in axialsymmetric configuration, with internal laminar flow of water with pre-determinate velocity. The water flow, during its pass, are heating by resistor, simulated as heat...
View ArticleLaminar flow in vertical pipe
Hi, I'm trying to do a simple model of laminar flow in a vertical pipe. The model is coming out fine before I add gravity, but when I add gravity via a Volume force of -9810 N/m^3 in the y direction I...
View ArticleMicrostructure design
While computing, I have got an error which was mentioned like: "The following feature has encountered a problem. - Feature: compile equations: stationary(sol1/st1) - Error: Duplicate variable name....
View ArticleGeometry Modification
Hi, I just want to know if there is an easy way for geometry modification in comsol. For example if I have done some simulation on a plate with a hole in it, and then I want to repeat the simulation on...
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