Latest Discussions - COMSOL Forums https://www.comsol.com/forum/ Most recent forum discussions Mon, 24 Jun 2019 20:59:30 +0000 COMSOL Forum: Latest Discussions https://www.comsol.com/shared/images/logos/comsol_logo.gif https://www.comsol.com/forum/ Evaluating Objective function from only part of a parametric sweep https://www.comsol.com/forum/thread/237902/evaluating-objective-function-from-only-part-of-a-parametric-sweep?last=2019-06-24T20:59:30Z <p>Dear all,</p> <p>I am sweeping an electromagnetic problem in frequency domain. If I am investigating for example frequencies 1, 2, and 3, is there a way to create an objective function that is only evaluated for frequency 1, and another for frequency 2 and so on? I'm thinking something like the at() function but for general parametric sweep.</p> Mon, 24 Jun 2019 20:59:30 +0000 4.2019-06-24 20:59:30.237902 Why do Comsol and Ansys have different mode shapes? https://www.comsol.com/forum/thread/237901/why-do-comsol-and-ansys-have-different-mode-shapes?last=2019-06-24T18:57:30Z <p>Hi,</p> <p>I am doing coupling anaysis for structural vibration and acousitc pressure. I have compared the result from Comsol to that from Ansys, but they have different mode shapes. Since I do not use Acoustic-structure interactions, I totally understand eigenfrequencies should be slightly different, but the mode shapes should be same.</p> <p>Every condition such as bounday conditions, contact, or material properties is same in Ansys and Comsol, but they show some different mode shapes. Why do they result in that differece?</p> Mon, 24 Jun 2019 18:57:30 +0000 4.2019-06-24 18:57:30.237901 Electric field - electric potential - AC/DC Module https://www.comsol.com/forum/thread/237891/electric-field-electric-potential-ac-dc-module?last=2019-06-24T18:08:44Z <p>Hello,</p> <p>I'm trying to simulate a photonic crystal with the AC/DC module. Does someone know why i'm having no variaton on electric potential or electric field when i changed the currently work frequency ?</p> <p>Thank you in advance,</p> <p>Saúl</p> Mon, 24 Jun 2019 18:08:44 +0000 4.2019-06-24 18:08:44.237891 Plotting Coordinates for Specific Condition (Heat Transfer) https://www.comsol.com/forum/thread/237882/plotting-coordinates-for-specific-condition-heat-transfer?last=2019-06-24T15:30:48Z <p>Is it possible to plot a graph of x,y coordinates for a specific temperature condition in COMSOL?</p> <p>I am taking a slice, similar to the one attached, out of a 3D model and looking to create a graph of the position coordinates for one tempearature. From the picture, the goal would to have the graph look like a parabola.</p> <p>I found that exporting the data and using python to get the coordinates wasn't sufficient since there wasn't enough data points in the temperature range I wanted.</p> <p>Thanks</p> Mon, 24 Jun 2019 15:30:48 +0000 4.2019-06-24 15:30:48.237882 Delete user defined material https://www.comsol.com/forum/thread/237881/delete-user-defined-material?last=2019-06-24T14:37:05Z <p>Hello fellow COMSOLers,</p> <p>is there a way to remove materials from the user defined materials library. I already checked the forum and manual but cannot find anything.</p> <p>Any advice is greatly appreciated.</p> <p>Best regards, André</p> Mon, 24 Jun 2019 14:37:05 +0000 4.2019-06-24 14:37:05.237881 SAW Device with IDTs https://www.comsol.com/forum/thread/237872/saw-device-with-idts?last=2019-06-24T17:06:34Z <p>I'm trying to create a finite-sized surface acoustic wave device (file attached) with gold electrodes for the IDTs.</p> <p>Essentially, I'm creating an IDT similar to https://www.comsol.com/paper/download/213121/dixit_paper.pdf but looking at what happens to the wave as it penetrates the piezoelectric substrate without the periodic boundary conditions (since the IDT I fabricate will be finite sized). There are a few simulations I wish to run:</p> <p>(1) Finite-sized (i.e. no periodic boundary conditions) surface acoustic wave device (2) 3D version of IDT -- i.e. extrude the entire setup along an axis (3) IDT with input and output ports, as in the paper linked.</p> <p>I cannot seem to get any of these three to work; I've attached files from (1), could someone take a look and see if I'm doing anything in my setup wrong? How would I set up an output port and get the resonance plot?</p> Mon, 24 Jun 2019 14:09:54 +0000 4.2019-06-24 14:09:54.237872 Deposited Ray Power https://www.comsol.com/forum/thread/237862/deposited-ray-power?last=2019-06-24T13:45:27Z <p>Hi all,</p> <p>I am modelling a Winston cone by using geometric optic engine. I'm sucessfull getting the ray trajectories but however when I computed the deposited ray power at the entrace aperture and the exit apeture of the cone, they are always zero. Attached is the screenshot from my simulation. Please help me to compute the power enterinng and exiting the cone.</p> <p>Thank you,</p> Mon, 24 Jun 2019 13:49:38 +0000 4.2019-06-24 13:49:38.237862 In the acoustic module, how to set the parameters of anisotropic materials https://www.comsol.com/forum/thread/237853/in-the-acoustic-module-how-to-set-the-parameters-of-anisotropic-materials?last=2019-06-24T13:39:06Z <p>In the acoustic module, how to set the parameters of a material when the density of mass or the bulk modulus of elasticity is anistropic i.e. the density of mass or the bulk modulus of elasticity of the material is a martrix?</p> Mon, 24 Jun 2019 13:39:06 +0000 4.2019-06-24 13:39:06.237853 Difference between available Hydrogen gas models https://www.comsol.com/forum/thread/237833/difference-between-available-hydrogen-gas-models?last=2019-06-24T10:48:32Z <p>What is the difference between the following?</p> <ul> <li>Liquids and Gases > Gases > Hydrogen</li> <li>Material Library > Elements > Hydrogen > Hydrogen [gas] > Hydrogen [gas, H2]</li> </ul> <p>Specifically with respect to equations for density (the second one has density independent of pressure).</p> Mon, 24 Jun 2019 10:48:32 +0000 4.2019-06-24 10:48:32.237833 Training courses https://www.comsol.com/forum/thread/237832/training-courses?last=2019-06-24T13:41:29Z <p>Hello, I was interested in learning how to use comsol for simulation of penetration of drugs in spheroids in peritoneal cavity tumors Is there any training courses given by comsol or textbook that can help me in this issue</p> Mon, 24 Jun 2019 07:14:46 +0000 4.2019-06-24 07:14:46.237832 Ground Temperature Profile https://www.comsol.com/forum/thread/237821/ground-temperature-profile?last=2019-06-24T06:11:47Z <p>I need to set boundary condition as Ground Temperature profile given by Kasuda function<img class="latexImg" src="data:image/png;base64,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" /> however i am not getting desired plot, is the cos function in Redian or in degree ? Tmean 18.5 mean surface temperature Tamp 21 apmlitude of surface temeprature depth 1 1 Depth of the Ground a 0.1728 Thermal Diffusivity tshift 35 minimum surface temp O 3.14/365 omega</p> Mon, 24 Jun 2019 06:11:47 +0000 4.2019-06-24 06:11:47.237821 Sin function in COMSOL https://www.comsol.com/forum/thread/237811/sin-function-in-comsol?last=2019-06-24T06:04:53Z <p>Dear , how to put sin function at boundary condition.</p> Mon, 24 Jun 2019 06:04:53 +0000 4.2019-06-24 06:04:53.237811 modeling heat transfer in LiNb at 10**-2 K and with a heat source, power of heat source 10**-3 W https://www.comsol.com/forum/thread/237792/modeling-heat-transfer-in-linb-at-10-2-k-and-with-a-heat-source-power-of-heat-so?last=2019-06-23T23:52:49Z <p>Hi,</p> <p>I am traying to model heat transfer in a lithium noibate resonator at E-2 K tempreture. So I defined heat conductivity k=4T<strong>3 and heat capacity 0.000234T</strong>3 at E -2 K with a heating source which has a power of E-3 W (a laser source 1550 nm wavelenght). The problem is when my power is less than E-8 It gives me a solution which I attached here but when I put my actuall power E-3 W it gives me this error:</p> <p>Feature: Time-Dependent Solver 1 (sol1/t1) Failed to find consistent initial values. Error in user-defined function. Function: comp1.mat9.def.K Failed to evaluate variable. Variable: comp1.mat9.def.k33, Defined as: (comp1.mat9.def.K(comp1.T/unit K cf)<em>unit W cf)/(unit K cf</em>unit m cf) Failed to evaluate variable. Variable: comp1.ht.kzz, Defined as: comp1.mat9.def.k33 Failed to evaluate variable. Variable: comp1.ht.k effzz, Defined as: comp1.ht.kzz Failed to evaluate variable. Variable: comp1.ht.dfluxz, Defined as: (-comp1.ht.k effzz)<em>comp1.Tz Failed to evaluate expression. Expression: d((2</em>(comp1.ht.dfluxr<em>test(comp1.Tr)+comp1.ht.dfluxz</em>test(comp1.Tz))<em>comp1.ht.d</em>pi<em>r)</em>(dvol spatial),{test1}) Failed to evaluate Jacobian of expression. Expression: (2<em>(comp1.ht.dfluxr</em>test(comp1.Tr)+comp1.ht.dfluxz<em>test(comp1.Tz))</em>comp1.ht.d<em>pi</em>r)*(dvol spatial) Last time step is not converged.</p> Sun, 23 Jun 2019 08:29:36 +0000 4.2019-06-23 08:29:36.237792 Angled Waveguide 2D https://www.comsol.com/forum/thread/237791/angled-waveguide-2d?last=2019-06-23T14:44:52Z <p>Dear All</p> <p>I have problem in Geometry. I am trying to Draw an angled waveguide with 60 degrees bend. Help will be appreciated</p> <p>Thanks in Advance</p> Sat, 22 Jun 2019 17:16:52 +0000 4.2019-06-22 17:16:52.237791 electrokinetic flow in nano channel https://www.comsol.com/forum/thread/237781/electrokinetic-flow-in-nano-channel?last=2019-06-22T13:53:40Z <p>I made a nano channel where I took electrostatics, transport of diluted species. i took K+ and Cl- as ions to move by controling potential. how can i get the ionic current vs potential graph.</p> Sat, 22 Jun 2019 13:53:40 +0000 4.2019-06-22 13:53:40.237781 Liquid medium surrounding BAW resonator https://www.comsol.com/forum/thread/237771/liquid-medium-surrounding-baw-resonator?last=2019-06-22T08:54:37Z <p>I’m trying to model viscous damping effects on an in-plane BAW resonator immersed in a liquid. How do I set up my resonator as a body in an infinite stationary liquid medium (only flows in the liquid are due to motion induced by contact with the resonator)? And how do I simulate viscous effects on the body?</p> <p>Any help will be much appreciated!</p> Sat, 22 Jun 2019 08:52:12 +0000 4.2019-06-22 08:52:12.237771 Plot Number of Mesh Elements versus Parametric Sweep https://www.comsol.com/forum/thread/237762/plot-number-of-mesh-elements-versus-parametric-sweep?last=2019-06-21T18:12:18Z <p>I use a parametric sweep to define increases in size of the geometry. How can I plot the total number of mesh elements over the parametric sweep?</p> <p>I.e., I have a square domain that doubles in size a few times. The side legnth of the square goes from 2, to 4, 8, 16, 32, 64. The elements are fixed at size 1, so the number of elements goes 4, 16, 64, 256, 1024, 4096. How can I get comsol to plot the number of elements vs. the interation of the sweep?</p> Fri, 21 Jun 2019 18:12:18 +0000 4.2019-06-21 18:12:18.237762 S parameter analysis for optics https://www.comsol.com/forum/thread/237752/s-parameter-analysis-for-optics?last=2019-06-21T16:18:49Z <p>Hi, I am trying to figure out the S-matrix for an optical ring resonator. Can I use COMSOL for this?</p> Fri, 21 Jun 2019 16:18:49 +0000 4.2019-06-21 16:18:49.237752 Validity of Fick's Law of Diffusion https://www.comsol.com/forum/thread/237742/validity-of-fick-s-law-of-diffusion?last=2019-06-21T16:08:34Z <p>I am working on the diffusion induced stress and deformation. The deformation is large of the order 300%. I recently read that for <em>large deformation</em>, Fick's second law is not valid in the spatial framework. This would mean that I have to use (dC/dt)+grad(J)=0 in the material framework. But in material framework, is J = -D grad(C)?</p> Fri, 21 Jun 2019 16:08:34 +0000 4.2019-06-21 16:08:34.237742 Non-zero stress and strain values for zero displacement with no preloading https://www.comsol.com/forum/thread/237733/non-zero-stress-and-strain-values-for-zero-displacement-with-no-preloading?last=2019-06-21T10:50:53Z <p>Hi, I am trying to validate a compression test of hyperelastic material silicone. So I have taken a single cubical element of 1mm dimension and I have applied a prescribed displacement upto 0.5mm in compression. Now I am facing the following difficulties:</p> <ol> <li>The cube is bowing inwards rather than bulging outwards for the compressive loading. (Image attached) The response does not improve by meshing with multiple elements.</li> <li>There is non-zero stress (too high) and strin values for zero displacement of the element. (I am using auxiliary sweep) (See the probe table in the image) </li> </ol> <p>I am using Ogden Model with N=2 for compressive test data.</p> <p>I have been facing these high strain and stress values even for 2D simple models containg hyperelastic materials. One peculiarity is that the stretch value was correct but the strain was too high violating their relationship.</p> <p>Can anyone please help me out with this?</p> <p>Thanks.</p> <p><a href="https://drive.google.com/file/d/1LiRDgerBv1ZpWaUupRpqIuFIpIgCoAOd/view?usp=sharing">compression.png</a></p> Fri, 21 Jun 2019 10:46:07 +0000 4.2019-06-21 10:46:07.237733