Mohamed Sobh’s Post

Keyhole formation during the LPBF process. LPBF includes intricate interactions between laser energy, powder material, and the resultant melt pool. These interactions take place at high temperatures and include phenomena such as vaporization and fluid movement, which are difficult to monitor. CFD simulations serve as a virtual window, allowing us to see and examine these processes in greater detail. The keyhole is essential for a good LPBF. A well-behaved keyhole promotes optimum melt pool geometry and smooth material deposition. CFD models can forecast keyhole parameters like as depth, size, and stability. This information is critical for adjusting laser power, scan rates, and other LPBF process parameters to obtain the desired keyhole profile. Uncontrolled keyhole dynamics can cause flaws such as porosity (air pockets) and spatter (ejected molten material). The application of AM PravaH, a customized CFD program for additive manufacturing simulations, is demonstrated in the movie. AM PravaH is a potent tool for AM process optimization as it probably includes features and models designed especially to simulate the intricate physics of LPBF. #additivemanufacturing #lpbf #meltpool #simulation #AMPravaH

CFD Tuesday - Pump it up (again) This week we are showing another method to simulate the motion of the compression; the Overset mesh. In this approach, we don't morph the mesh but we have a moving mesh part and a backgroud mesh part instead. As the moving part goes up, cells in the background region are deactivated, and some cells are used to communicate between the background and overset region. If you're wondering why would you need two different methods to simulate the same, it is because these methods have different strengths and weaknesses. The morpher works best for simple geometries that don't change too much, while the overset mesh allows for greater motion and even closing off regions. The morpher doesn't have the transfer between the overset and background, and is a really stable and robust method. If you want to know more, don't hesitate to contact us! #overset #mesh #CFD #Engineering #Femto #Simulation

In the laser powder bed fusion (LPBF) additive manufacturing process, defects such as porosity can significantly deteriorate the mechanical properties of the products, especially pores that form due to the keyhole instability in the molten pool. Numerical simulation, specifically CFD of the LPBF process, is an efficient method for reducing costs and understanding the formation mechanisms of keyhole pores. The laser beam releases heat flux onto the metal surface, elevating its temperature. Once the solidus temperature is surpassed, the metal undergoes a phase transformation, initiating melting and forming a molten pool and keyhole. To enhance the simulation accuracy, UDFs have been written in C++ to account for energy and momentum sources, as well as phase transformations. Our research clearly demonstrates keyhole formation and molten metal flow results, using a coupled DEM-CFD process. #LIGGGHTS #Porosity #Additivemanufacturing #ANSYS #Fluent #CFD #LPBF #Simulationandmodeling

Discover the power of advanced fan modeling in CFD simulations with our latest video on the Moving Reference Frame (MRF) approach in Ansys Icepak. This method significantly improves flow prediction accuracy around fans compared to the simpler 3D Fan Object. #ansys #thermaldesign #thermalengineering #fandesign #fanengineering https://hubs.ly/Q02SnNQP0

AcuSolve and EDEM in Particle Mixing Simulations The fluid flow analysis (CFD) solver AcuSolve and the individual element method (DEM) solver EDEM were coupled to investigate the mixing of particles in the stirring layer. ・ In the #simulation, you can check the state of the particles in the stirring layer when the stirring conditions are changed with less man-hours than in the experiment. ・ Changes in the baffle shape, which would be costly in experiments, can be easily investigated with simulations. ・ #AcuSolve can output the torque applied to the stirring blades, so it is possible to examine the conditions in comparison with the performance of the rotating equipment. ・ Since #EDEM can count the number of particles in the defined area, the stirring status can be checked as numerical data.   By using AcuSolve and EDEM, you can calculate the behavior of the particles in the stirring layer at real scale, which can be used to determine the appropriate stirring conditions. For more details visit here 👉 https://lnkd.in/gzdhmNSa Altair #AcuSolve #AltairEDEM #SimLab #CFD #DEM #OnlyForward

#FeelTheMesh 2 How much high 🦒 can I go ??? Boundary layer inflation in CFD Selected face: Topmost face Keeping other factors constant, Maximum layers: 2,4,10,100,150,200 ✅ Successful Layer Counts: 2, 4, 10, 100 💻 Successful but high volume count for further computation: 150 ❌ Unsuccessful Layer Counts: 200 Note: Keep growth rate and transition ratio constant Note2: a) Growth rate = next boundary layer cell thickness/ previous boundary layer cell thickness, b) Transition ratio = boundary layer cell thickness in last boundary layer / first cell thickness in volume fill #boundarylayer #ansys #maximumlayers #openfoam #CFD #ComputationalFluidDynamics #Simulation #Engineering #Optimization

Ansys Charge Plus 2024 R1 Featured Update #3: HFSS Field Import for FEM Users now have the ability to import electromagnetic fields from Ansys HFSS into Charge Plus’s finite element method (FEM) solver. This includes waveguides which are important because they are used to excite plasma. This gives users a way to see how plasma species would react to the electromagnetic fields generated from an HFSS model. This is especially helpful when using the PECVD method. Learn more about this feature and what else is new by attending the webinar “Ansys Charge Plus 2024 R1 What’s New” April 23 at 9 a.m. MT. You can sign up by clicking on this link- https://lnkd.in/gEbxAj3W. #EMA #ChargePlus #Ansys #simulation #HFSS #FEM

Build Fast and Accurate CFD Meshes with Mosaic Technology! Mesh creation can be a challenge, but Ansys’ Mosaic technology makes it easier: 🔹 Accuracy & Speed: Combine different mesh densities for precise boundary layers and fast bulk processing. 🔹 Seamless Connections: Connect disparate meshes effortlessly. 🔹 Efficiency: Use fewer cells, less memory, and get solutions in half the time. Transform your CFD simulations with ease and efficiency! #EngineeringExcellence #CFD #Innovation #TechForGood #SimulationSuccess

Hello! In CFD modeling, generating the local size mesh is crucial. Check out this video to learn how to use the body of influence in ANSYS watertight workflow. #ansys #ansysfluent #ansysmesh

Ansys Rocky is our discrete element method (DEM) software that can simulate complex particle flows, including any solids, 2D shells, and rigid and flexible fibers. In 2024 R1, updates to Ansys Rocky software include: - Improved DEM simulation with other physics - Enhanced Smooth-Particle Hydrodynamics (SPH) capabilities - PyRocky from pre- to post-processing - New user interface with style standardization and dark theme as the new default Register for the upcoming 2024 R1 Rocky webinar to learn more: https://ansys.me/49ImqgI #engineering #ansys #simulation #dem #particle #simulationsoftware