Coaxial Borehole heat exchanger
Dear COMSOL users, I work on geothermal heating systems using borehole heat exchanger (see file attached for general functioning of coaxial geothermal exchanger). To that purpose, I use non-isothermal...
View ArticleProblem: how to ad gas generation in EulerEuler model??
Hi everybody, I'm developing the model of an alkaline cell for electrolysis of water, thus I need to consider the generation of gas at the electrodes that gives a two-phase flow as a result. I'm...
View ArticleOptimization
Hi all, I have run an time dependent optimization. I have set up the problem and ran the simulation along with the optimization module. Again when I insert the new optimised values for the parameters,...
View Articledifferences between conservative ans non conservative forms in phase field or...
hi friends, what are the differences between conservative and non conservative forms of phase field and level set methods ?? do the conservative forms conserve the mass better ? are they more time and...
View Articleuser defined convective heat transfer coefficient for solid-liquid interface
Hi, How can I give a user defined convective heat transfer coefficient, h, to COMSOL for a solid-liquid interface? The inlet temperature of the fluid and its flow rate are known. The h value I want to...
View ArticleFSI convergence - tiny time steps
Hi, I have succesfully simulated the pulsatile blood flow in a - 2D axisymmetric model - stenosed artery with two study steps (1.Time dependent 2.Stationary) in the same way as in the example...
View ArticleSolidification countour
Hello! I am new to COMSOL. Is it possible to get solidification counter for metal casting simulation?
View ArticleSolid-Phase Extraction in Segmented Flow
i want create particle tracing inside droplet to two phase flow
View ArticleHow to add inertial lift force and Dean force
Hi everybody, I m doing simulation for inertial focusing. I need to see the effect of inertial lift force and dean force on particle. I m just wanted to know where these forces can be defined. I tried...
View Articlecontinuity equation
Hello Is there a way to check if the continuity equation is satisfied when we solved the Navier Stokes equation in COMSOL? Thanks.
View ArticleHow to define slip at wall only with slip length?
I am simulating a slip flow in a V grooved micro channel. Its only a pressure driven flow where, slip is given at the microchannel wall i.e, on the walls of 'V'. When I am using the Slip velocity under...
View ArticleWhat if turbulent flow is modeled using laminar flow
Dear all, I have the following questions: 1) What if a turbulent flow is modeled using laminar flow? 2) How different will the results of turbulent flow and laminar flow models be (note that the...
View Articlemoving heater
Hi, I am trying to model heat transfer to a fluid flowing in a rectangular duct. The duct is heated at the bottom wall through a rectangle step function such that only a short length of the wall is...
View ArticleCalculation of circulatory and rise velocity using level set method
Dear Invar, I tried to calculate circulatory using intop1 operator but I failed. I would like to know to calculate circulatory and rise velocity of a bubble rising in a stagnant fluid. Thank you in...
View ArticleFlow focusing microfluidic droplet generator
Hello all, I'm completely new to comsol, and have therefore been looking for instructions on how to generate a flow focus droplet generator simulation. I've been playing around with the t-junction...
View ArticleProblem: Oil Droplets Seem To Dissolve In Water (Two-Phase Flow, Level Set)
I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are...
View ArticleHeaviside problem
Hello for everybody , I am trying to make a square pulse train, and was read a lot of forums for this..but unfortunately I didn't get pulse train...just one 5us pulse with DV amplitude.. My rectangular...
View ArticleModelling shape-changing bubble in the water
Hi all, I'd like to model a bubble changing shape in the water due to different pressure levels applied on the two domains. For now, I am running a test model with no applied pressure, but it kept...
View ArticleEscape Radius/Velocities of Particle flowing in a past a T-junction
I am trying to model an automated syringe(100um) sampling out 45um particles as they slowly flow through a channel about 1cm in diameter. I would like to know what is the effective area in which I can...
View ArticleProblem: Oil Droplets Seem To Dissolve In Water (Two-Phase Flow, Level Set)
I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are...
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