Finite

Today, solve one of the NAFEMS Benchmark tests for thermal analysis using COMSOL. (ref : A.D. Cameron, J.A. Casey, and G.B. Simpson, NAFEMS Benchmark Tests for Thermal Analyes. NAFEMS Documentation) The problem definition is as follow. The geometry has a height of $1m$ and width of $0.6m$, with the bottom boundary fixed at a temperature of 100 degrees Celsius. The left side is a perfect insulato..

Today, I'll simulate the interference between two slits composed of waves or sound using COMSOL. I'll generate plane waves using two thin wavelengths leading to the slits on the screen and calculate the pattern on the opposite side. For detailed information, please refer to the COMSOL Application Library. Theoretically, the amplitude becomes minimal where the difference in path length is an odd ..

Since its first time conducting CFD through COMSOL, I plan to follow the "Flow past a Cylinder" example found in the COMSOL application manual. Fluid flow becomes unstable behind large bodies, making it challenging to compute. The wake formed behind the body generates significant resistance due to all sizes of disordered vorices. However, turbulence in the thin boundary layer beside streamlined ..

At the beginning of this blog, I calculated the teoretical Eigenfrequency and compared the theoretical solution with the analysis results obtained through modal analysis in COMSOL and Optistruct(7_Modal analysis and 8_Modal analysis(2)). Today, I will conduct a Modal analysis with the same material properties and boundary conditions using Ansys. The geometry to be used for the problem is as foll..

I have conducted structural analysis using Optistruct and COMSOL, and my experience with Ansys has been limited to CFD analysis and electromagnetic analysis, which I have not yet uploaded. While working on CFD analysis, I became interested in trying structural analysis with Ansys as well. Therefore, I preoceeded with a simple example and plan to compare the results with those from a previous pos..

In the last post(76_Topology Optimization using Optistruct), I attempted a compliance minimization topology optimization problem in Optistruct. I wanted to compare it with Sigmund's paper, so I tried a simple setup, but it was difficult to make an accurate comparision, and more importantly, the results were not sarisfactory to me. The biggest advantage of using commercial software for optimizati..

In the last post(75_A 99 line topology optimization code written in Matlab), I wrote a review about paper on topolgy optimization using MATLAB. Today, I will proceed with topology optimization in Optistruct, setting the boundary conditions and constraints identically to those presented in the MATLAB code from that paper. The code feature in the paper is commonly referred to as the "99line". In t..

In this post, I'll conduct a crash analysis of the mid rail using HyperCrash. Model - Material Piecewise linear RHO_I(Initial density) : 7.85e-6 E(Young's modulus) : 206 Nu(Poisson's ratio) : 0.3 Model - Property Shell Thick(shell thickness) : 1.6 Contact interface Stfac(Scale factor for stiffness) : 1 Gapmin(Min. gap for impact activ) : 0.9 Fric(Coulomb friction) : 0.2 Control Card RUN_NAME_NUM..

Continuing from the last post, in this post, I'll analyze the fluid structure coupling example and look at the results. In HyperCrash, load the .rad file. Part It consists of a tank container and meshes for air and water. Property Since hourglass was explained in the previous post(12_S-Beam Crash),I won't go into detail here and will focus only on setting the parameters. Tank container hm(Shell ..

In this post, I will execute the "fluid structure coupling" example found in the RADIOSS guide. The description in the guide is as follows. Solshing inside a fuel tank by simulating the fluid structure coupling. The tank deformation is achieved by appling an impsed velocity on the left corners. Water and air inside the tank are modeled with the ALE formulation. The tank container is described us..