Coupling of 2d axially symmetric geometry with 3D-T-junction
Dear all, I am modeling a flow simulation where I would like to couple axially symmetric tubes to a 3D T junction (pipe flow would not be an option for me as my fluid flow is a little special - I need...
View ArticleShear Rate Function?
Hello, I'm making a simulation of a needle injection to the body and I want to find the Shear Rate at various points (along the edge, in the middle, on the outside of the needle). I've found some...
View ArticleHow to find Drag Force on Airfoil Surfaces for 3D geometry but with 2D fluid...
Hi, To cut the long story short, I am modelling an airfoil based on NACA 4418 profile. My simulation set-up as follows: Wind speed: 5m/s, 10m/s, 15m/s and 20m/s Angle of Attack: 0, 5, 10, and 15 deg...
View ArticlePorous media with cfd
I'm trying to join three consecutive tubes, the first with turbulent flow, the second with a porous medium, and the last turbulent again. I'd like to solve all the parameters continuously, in...
View ArticleModule with VIP to melt ice
Hello, I am very new with Comsol, in fact I just started using it. I am currently undertaking a project to analyse the heat transfer in a module. The geometry includes a Vacuum Insulation Panel as an...
View ArticleLaminar flow without outlet (mixing with sliding wall) does not find solution
Hey, I have been trying to simulate a system where a sliding wall is causing convection in a closed box. In brief, the system is a box with one wall sliding at a rate of 0.01 m/s. The other walls are...
View Article[For dimensionless NS equation PDE model]
Hi, I want to construct a dimensionless fully coupled multyphysics model ( NS, Poisson and convective-diffusion). and there is a big problem in dimensionless NS model, I have seen at the COMSOL forum...
View Articlesimulating the water wave
Hi, Does anyone know how to simulate the propagating water wave? I use the moving mesh and use moving wall to simulate the wave maker but it is said last time step does not converge. Is there anyone...
View ArticleHow to simulate fine particles flow in porous media?
I want to simulate fine particles flow in coal fractures, but the 'particle tracing' module doesn't take the particle itself into consideration. Is there any module can do that, and also including...
View ArticleFluid flow in a heated flux media porous
Hello, I pretend to built a model where I simulate the heat transfer to air flow through a porous media (in a channel with an inlet and outlet). My fluid is the air and the porous structure is the SiC....
View Articlehow to write expression for flc2hs?
Hi Comsolers, I have an expression which is 1.112e-4*(U_esvr>=1.112e-4)+0.0*(U_esvr<1.112e-4). I want to use heaviside step function, so how can I write it in flc2hs? Information: working with...
View ArticleGeneral question about CFD module capability
Hello, I would like to simulate the flow of two different gases coming in opposite directions into a chamber. Is it possible to specify when each gas begins to flow and the duration of the flow? For...
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 ArticleThe setting of keyhole temperature in the laser welding
Hi, i am trying to simulate the weld pool procedure of laser welding, and i have some questions: if latent heat is ignored( namely, heat capacity is 800J/kg*K) and the temperature of keyhole is set as...
View ArticleInternal re circulaiton in droplet
Hi, At the outset I should mention that I am novice in Comsol with very limited experience. I am trying to model air flow around water droplet. For the time being it is assumed that there would not be...
View ArticleStabilization parameter
Does anybody know how is the stabilization parameter for the streamline stabilization? I am solving a bi-dimensional transient advection- diffusion equation by the chemical species transport branch. I...
View ArticleUsing results from the previous time step
Is there any way to use the results of the previous time step when using the time dependent solver? I'm solving for saturation and want to compare the level of saturation with the previous saturation,...
View ArticleIntegration of Area inside an Ode's
Dear collegues, for my study, a shape of the meniscus of a molten metal due to lorentz' forces, i coupled the moving mesh ale and an ode module. The ode is needed to guarantee the moving mesh ale the...
View ArticleTri-axial test on a coal sample
Hi Nagi, I'm trying to model permeability change and creep in a cylindrical coal sample under tri-axial stresses (Axial and confining), through which methane permeates from one circular end and exits...
View ArticleCOMSOL giving me wrong Ks value!
Hi, I am using the Richards Equation interface and there is an equation relating kappa (permeability) to k (hydraulic conductivity) which is written in the documentation but I have calculated by hand...
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