Non-isothermal pipe flow (nipfl)
Gooday, I'm using non-isothermal pipe flow model and heat transfer in solids physics in order to simulate a bore hole heat exchanger (BHE). the problem consist of a tube modeling by nipfl and a ground...
View ArticleDiscrepancy between particle trajectory and streamline?
Hello, I'm trying to teach myself how to use the particle tracing module, so I'm modeling a simple T-junction microfluidic channel. I get an unexpected result, however, when I trace the particles....
View ArticleParachute CFD simulation
Hello, I am trying to perform a CFD flow field simulation of a 3D parachute to find its lift and drag. The geometry model is imported from a CAD software as surfaces only (no thickness). I attached one...
View ArticleProblem in 1D EHD simulation
Dear all, I have built a 1D EHD in COMSOL. But it does not work. There always exists an error. Can anybody give me any suggestion? Please help me! My *.mph file is in the attachment. The error is as...
View ArticleInlet pressure boundary condition not allowing COMSOL to converge
Hi, In my simulation (file attached here), I'm modeling a slight variation of the 2D axi-symmetric 'stirrer in a cylinder' situation, which is on COMSOL model library. In my variation, there is applied...
View ArticleComsol not following ideal gas law or conservation of mass
Hello, I am currently working on modeling a high temperature hydrogen heat exchanger. I decided to start as simple as possible and just model the heat transfer into an axi-symmetric tube of hydrogen...
View Articleinertial focusing in microfluidic channel
Firstly，I want to modeling inertial focusing in straight and curved microfluidic channels（may the channel geometry seems like more complicated ）,just...
View ArticleConvective heat flux
Hi, I'm trying to see the heat conduction from the electric power conduit pipe to the soil surrounding the pipe. The square part which I attached as model.png is the pipe and inside. I built two point...
View ArticleSimulation of evaporation of water drop
A water drop is resting on a solid substrate and evaporating continuously. I want to stimulate this to know the fluid flow inside the drop while evaporating. I am a beginner. Please help me.
View ArticleA closed pipe
I want to model a pipe has only an outlet, In fact, I changed inlet to wall. How can I define boundary condition for this case? I attached an image, TX
View ArticleStopping the flow in a pipe after a certain time
Hi, I am new to COMSOL and I am simulating the expansion of steam in a a condenser from a cylinder. They are connected by a pipe. The expansion is due to pressure difference. I need to run the...
View Articleconstraining the range of dependent variables
Hello, I have implemented an axisymmetric drift-diffusion equation using the equation-based modeling interface in COMSOL 4.3 (incorporating the necessary terms due to the curvilinear coordinates). I...
View ArticleFlow Separation in fluid flow around a sphere
I am new to COMSOL MULTIPHYSICS. I want to find out at which Reynolds number the flow separation starts in laminar flow.How can I exactly find the point of separation ?
View ArticleProblems with STEP FUNCTION
Hi everybody, I have an inlet in a water reactor working in the following way: 10 s on, 80 s off, 10 s on, 80 s off.... -Fist of all, I have built a PIECEWISE (pw1) function (0<t<10 = 1,...
View ArticleCoupling transport of a species to surface reactions
Hello, I am trying to make a model that has laminar flow, transport of a dilute species, and surface reactions. I want the laminar flow and transport of a dilute species to distribute the chemical...
View ArticleComsol not following ideal gas law or conservation of mass
Hello, I am currently working on modeling a high temperature hydrogen heat exchanger. I decided to start as simple as possible and just model the heat transfer into an axi-symmetric tube of hydrogen...
View Articleconstraining the range of dependent variables
Hello, I have implemented an axisymmetric drift-diffusion equation using the equation-based modeling interface in COMSOL 4.3 (incorporating the necessary terms due to the curvilinear coordinates). I...
View ArticleDiscrepancy between particle trajectory and streamline?
Hello, I'm trying to teach myself how to use the particle tracing module, so I'm modeling a simple T-junction microfluidic channel. I get an unexpected result, however, when I trace the particles....
View ArticleSimulation of evaporation of water drop
A water drop is resting on a solid substrate and evaporating continuously. I want to stimulate this to know the fluid flow inside the drop while evaporating. I am a beginner. Please help me.
View Articleserval questions of heat transfer in my project
Hello As the figure shows, I am using the fllowing models (Heat Transfer>Conjugate Heat Transfer>Laminar Flow Stationary situation Surface-to-Surface Radiation), and try to find the temperature...
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