I used coupled Electrostatics physics and Transport of Diluted Species physics to simulate this problem. It did not help.ĭoes anybody know, what could be done to overcome the issue? I tried to change the aspect ratios for my model. But as soon as I try to mesh the air subdomain (using "mesh remaining(free)"), the following error appearsįailed to respect boundary element edge on geometry face. As a basis for this model I am using an example from the COMSOL MEMS Module Model Library "Cantilever Beam" 3D modelling with deformable meshes.ĬOMSOL successfully returns converted mapped/swept mesh for the beam and bottom electrode. The distance between the beam and the bottom electrode is 0.4 µm. I use symmery, therefore, the width of the model is 500µm instead of 1000 µm. The dimentions of the beam are 3000µm*1000µm*20µm. The layers have different internal stresseswhich makes the beam curl shoul it be released by underetching of the sacrificial layer. The active element is a prestressed cantilever beam made of two layers of Ni. I am trying to solve the following problem. I have checked the solutions suggested in this link, but it did not help much.Ĭould anyone tell me how to make the reaction rate 0 when the concentration of the substrate becomes zero? I do not understand where exactly should I introduce the term max(eps^2,Q). I also tried to add expressions such as *(S>0) in the reaction term of S, but I have not been successful either. If I don't do this, a part from getting negative solute concentrations, the growth of bacteria also gets corrupted (as it depends on S), and therefore this error impacts the whole model. So when S becomes negative, in the next time step it is seen as a 0 instead of a negative value. I've tackled this by deffinig variables s=max(eps^2,S), were S is the concentration of the solute. ![]() 1 day), but when bacteria start to grow considerably, the reaction terms become very big and negative (consumption), and thus the concentrations of the solutes become also negative. This works just fine for short periods of time (e.g. The growth of bacteria is modeled using PDE general form expressions. These reaction expressions are also multiplied by the concentration of the different species of microorganisms that consume each solute component (the higher the concentration of microorganisms the more they consume). The contaminant removal is modeled using the solute transport module with a reaction term, in which monod-like expressions are deffined. As a result of the degradation, this microorganisms also grow.įor the flow simulation I am using Darcy's Law. This kind of models consider the degradation of the influent solute components by several species of microorganisms. I am using a biokinetic model based on the ASM (activated sludge models) to simulate water contaminant removal in a gravel filter. Īnd similarly for the degrees of freedom, NaN/Inf in the matrix columns.Ĭan anyone please suggest why this type of error is coming and how to remove it? Detail: Undefined value found in the stiffness matrix. While solving equation based structure mechanics problem i encountered the following error message. I attach this model in this share link you can download it here: Is there any idea to get my goal results? I use frequency domain study and stationary or Time Dependent study, but in frequency domain I got error in convergence and in time dependent the circuit can’t stimulate the 3D model. ![]() Also, I want to study how much power transfer and how much is the efficiency. I want to study electrical field (E) and magnetic field (H) in 3D model. I use terminal in magnetic and electric field to connect the 3D model to circuit. The receiver coil is connected to a resistor load. ![]() My model has two physics:Įlectrical circuit supplies Sin power to transmitter in 4MHz frequency. One for transmitter and the other is for receiver. The model has two 3D microstrip(PCB with substrate) coil. I want to model and simulate a wireless power transfer module.
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