PID Temperature Control
Hey everyone, I am having trouble with PID control of a gas flow. Basically I have a pipe (shown as 2D ax) where air flows through it. A heater at the middle of the pipe (domain 2) heats the air to the...
View ArticleHow to plot the S11 plot of the patch antenna
I want to know how to plot the S11 plot for the patch antenna
View ArticleHow to save and get the plots while solving?
In many cases for the flow problem, the solution is obtained by adopting iterative solver that means we cannot reach the solution at one time such as eigenvalue problem or frequency domain problem....
View ArticleDiffuse Double Layer
Hello, I've been trying to model the effects of a double layer capacitance in a 3D system. Then I came across the following model tutorial that models the Diffuse Double Layer in 1D....
View ArticleTwo phase darcy law
Hi I am using transient two phase darcy law for resin impregnation through a porous material. The porous medium (rectangular block) of certain porosity and permeability contains cylindrical porous...
View ArticleLevel set method - defining the velocity
Hi all, I want to solve this simple system using level set methods. The model has moving boundary. The velocity of the boundary is given by, V= -∇〖P|〗_∂Ω.n_∂Ω+ G∇〖Γ|〗_∂Ω.n_∂Ω- AG 〖(n.x)|〗_∂Ω/2 (please...
View ArticleFailed to evaluate variable Jacobian.
-variable: mod1.jh.Qh -geometry:1 -domain:1 I cant find my fault. please help.
View ArticleMoving boundary problem
Hi all, Can we solve a moving boundary problem using the level set methods? Best regards Ashan
View ArticleCement bar subjected to high temperature, which analysis?
Good Morning, I am Linda, PhD student from Italy but now I am in LA at UCLA. Just a questions for you? I have to model a cement bar in according to ASTM standar C441. The bar will put in an environment...
View ArticlePhase change in a lake sediment
I'm trying to simulate a freezing process at the bottom of a lake and I want to include phase change of the sediment. I have been trying to implement it and at the moment it takes ages to simulate a 24...
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 ArticleODE equation : how to manage a variable that is physicaly bounded
Hi. Here is my question. My model implement an ODE equation on a temporal simulation. The ophysical variable is named u : The equation : ea*utt + da*ut =f In my actual case, ea = 0 and da =1 As a...
View ArticleUnidirectional Constraints
Hi I was trying to solve a system of 2 odes of second order using the coefficient form PDE module. One of the boundary conditions is a function of the derivatives of the variables. So I couldn't use...
View ArticleUsing different time solver for different physics
Hi. I am trying to solve a heat transfer pde and another ode but i wish to use different solver for each case i.e. time-dependent solver (BDF) for the heat transfer pde and time explicit solver...
View ArticleHow to specify infinite line currents in a 3D Magnetic Field model?
I have a Magnetic Fields model where an infinite line current induces current in a nearby passive loop. I have attached a toy model that illustrates this scenario, and image of the geometry. I define...
View ArticleStructured mesh query
Hello How can I mesh my 2-D geometry using a structured mesh? I tried using a mapped mesh but I cannot refine it if I want to. This is important since I have to carry out a mesh refinement study for my...
View ArticleCOMSOL Discretization Scheme
Hello I am working on a time dependent study using the MUMPS Solver. My question is: Which discretization scheme does MUMPS solver makes use of? COMSOL does not provide this information and I need to...
View ArticleInvalid field variable in property Llimitfivar
Hi, I'm new to Comsol 5.1 version and i have a problem with my simulation. Does anybody know what "Llimitfivar" is? I'm searching for it's meaning for some time and i can't find anything. I have no...
View Articletransient simulation using pipe flow module
Hey im trying to model 2 concentric pipes, in the inner pipe there is hot water flow(forced convection) and in between the pipes there is closed gap with cold water(natural convection), the outer...
View ArticleHow to do remote computing?
Hello guys, I'd like to do some remote computing but I don't know how to connect two PC's. One- the one I'm working on- needs to log into the Server, right? If I do, it alerts 'Connection refused'. I...
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