CFD testing of HeartAssist® LVAD performance under realistic working conditions

VADs are increasingly used to mitigate the shortfall in donor organs for cardiopathic patients awaiting heart transplants annually by providing a bridge-to-transplant, or to stabilize patients with congestive heart failure. While rotary VADs have smaller dimensions and simpler structures than pulsatile VADs, their continuous, high-speed, rotating blood-flow patterns represent a potential risk factor to patients from thrombus formation, thromboembolic complications or device malfunction due to pump thrombosis. Pump thrombosis is one of the main causes for device malfunction, and patients are exposed to the risk of sudden death or the risks involved in complex device replacement surgery. In this work, computational fluid dynamics (CFD) simulations were performed to mimic the realistic operative conditions of the VAD HeartAssist 5® (HA5, ReliantHeart Inc., USA). CFD analysis can be exploited to predict blood flow streamlines passing through these devices. Read the full case study here: https://enginsoftusa.com/CFD-Consulting-Medical-Ventricular-Device.html

EnginSoft and the European Space Agency investigate hydroponic plant growth for future space missions

EnginSoft has been collaborating with the European Space Agency (ESA) for the past ten years, working actively in the MELiSSA program. At present, this project’s main efforts concern the life support system sector and the idea of creating an artificially closed ecosystem that generates food and oxygen for space crews on longterm missions. The current MELiSSA Pilot Plant (MPP), built to monitor the progress towards the goal, is located at the Universitat Autònoma de Barcelona. A 5-meter plant growth chamber, able to cultivate 100 plants and investigate their growth process, has been installed At the MPP, the Air and Canopy Subcompartment Analysis (ACSA) project was implemented to study the impact of airflow on hydroponically grown lettuce crops. Objectives The main objectives of this project were: – To improve the conditions in the growth chamber by reengineering the air management system; – To investigate the impact of airflow on plant growth. Computational Fluid Dynamics (CFD) Model of the system before the project The 5-meter plant growth chamber was replicated using a CFD model of the complete system. This model provided deep insight into the air distribution and the local environmental conditions around the aerial part of the plants

Ergonomic simulation – greater company competitiveness and improved productivity

A satisfied employee can work in a concentrated, motivated and productive manner. A well-designed workplace that meets ergonomic requirements allows for comfortable and painless work. By optimizing workplace performance, reserves can be activated and productivity can be increased in the long run. Read the full case study here: https://enginsoftusa.com/pdfs/Ergonomic-Simulations-Vivelab-Ergo-case-study.pdf

Flow field optimization of a medical device

CAE is highly effective for product optimization. In this technical article, we describe how a hybrid method of computational fluid dynamics analysis was used to enhance the design of a medical device to improve its ability to maintain a stable microclimate around a patient, but also to reduce both the computational efforts and the time required to obtain these results. A microclimate requires the maintenance of specific values of temperature, humidity and air velocity around a patient.

One of the validated designs turned out to be very promising, as it obtains a further reduction of the heat loss compared to the best design of the NSGA-II first phase design optimization: a further 4% gained. As expected, this has been achieved by a solution that stays close to the limit value on the patient’s temperature and humidity, but still keeping a good margin from the assigned constraint value of 0.025. Read the full case study here: https://enginsoftusa.com/CFD-Consulting-Medical-Airflow.html

Design and Analysis of Chain Drives made easy by RecurDyn Multi-Body Software

Chain models are among the largest and most complex that can be simulated with multi-body technology. First, depending on the chain length, the number of moving bodies could become remarkable. Second, contacts disturb the solution all over the chain, causing continuous impulsive excitation of the mechanism. Third, chain links are bodies with reduced inertia, whose motion is driven by stiff contacts and stiff bushings. RecurDyn has built its reputation on chain application. The main reason is its hybrid solver, which uses an innovative approach with respect to its competitor. Even chain models featuring hundreds bodies and thousands contact points can be simulated in a reasonable time. Read the full case study here: https://enginsoftusa.com/pdfs/RecurDyn-Multibody-Dynamics-Chain-Analysis.pdf

Dana’s Use of a New Validated Approach for Advanced Design of Powertrain

Dana Incorporated is a valued automotive powertrain supplier because of the capabilities and value of their products. The Advanced Methods group at the Dana Technical Center looked for innovative technology that can be used in the engineering and design process for their products. In 2015, they evaluated the ability of Particleworks to predict the accumulation of oil on the surface of a rotating component within one of their axle assemblies. Particleworks is able to predict the oil accumulation on the spinning wheel on the right side of the axle assembly (top images are the side view, bottom images are the top view), with quite good matching the behavior in the actual physical test. Read the full success story here: https://enginsoftusa.com/pdfs/CFD-and-Multibody-Dynamics-combined-simulation-of-powertrain.pdf

Intermarine Shipyard tests Flownex SE for its naval piping systems

There are various piping systems that convey many different fluids on board a vessel. Each fluid must reach its user at the right pressure and flow conditions. Accessories such as valves, bends, fittings and pipes induce pressure losses (as a result of factors such as pressure (p), flow rate (q) and pipe size (diameter, A)). The designer has to calculate these probable pressure losses in the pipeline in order to select (or verify) the size of the pump to be installed in the piping system to prevent a number of possible problems. Usually, these calculations to predict pressure losses are performed “manually” using the procedures described in the technical literature, such as the method of equivalent lengths, with the help of software such as Microsoft Excel or similar, and with the lengths and the fittings information being derived from one-line diagram (2D CAD software). The Shipyard wanted to test the capability of the 1-D computational fluid dynamics (CFD) software known as Flownex Simulation Environment (SE), provided by EnginSoft S.p.A., as a pipeline solver for its naval piping systems. Read the full case study here: https://enginsoftusa.com/pdfs/Flownex-piping-design.pdf

Boat Hull Design with CFD

Starting from April 2018, the LincoSim web application was opened to three groups of industrial partners involved in the LINCOLN project and it has been massively used to support the design process of innovative vessels by means of automatic CFD runs. The preliminary statistical results in terms of usability and robustness are really encouraging. Hundreds of simulations have been carried out by nonexpert users in a few months. Nonetheless, we are now undertaking full validation tests to more properly assess the application’s accuracy by referencing towing tank data. This last activity, planned for completion by September 2019, should provide a meaningful benchmark on the real effectiveness of the tool. To see full case study click here: https://enginsoftusa.com/CFD-Case-Study-Boat.html

Transmission Oil Lubrication CFD Analsyis

Introduction of Particlesworks into Univance Corporation Oil has various important roles in lubrication, cooling, buffering and air tightness, whereas it causes torque loss for its flow resistance. For that reason, enough considerations and arguments are necessary for deciding conditions of oil physical property and quantity, and shape optimization. Therefore there was a requirement in Univance Corporation to confirm the real phenomena by simulation because it was too difficult to understand it only by Visualization of Oil Lubrication in the Transfer Case and the Transmission using Particleworks Fig. 1 – Products for automotive Oil has various important roles in lubrication, cooling, buffering and air tightness, whereas it causes torque loss for its flow resistance 22 – Newsletter EnginSoft Year 14 n°2 Case Histories Newsletter EnginSoft Year 14 n°2 – 23 experiment, which couldn’t be realized at that time. After a while, the request to visualize oil sloshing and lubrication for sufficient evaluation has increased and they’ve finally come into introduction of Particleworks through comparison with other CFD competitive solvers and benchmark test. In addition to fluid analysis, they need co-simulation of the chain behavior and the oil lubrication in the transfer case which is their key product. In other words, MBD has been a must and RecurDyn which can be coupled simulation with Particleworks has been introduced as well. Read the full case study here: https://enginsoftusa.com/pdfs/Visualization-oil-lubrication-particleworks-univance.pdf

Tracked Vehicle Dynamics Modeling and Simulation Methodology

Many Army vehicles require tracks in order to meet the tough mobility requirements for the Army mission profile. Modeling and Simulation (M&S) provides a large cost-savings and offers a quick turnaround when addressing vehicle performance issues. Once a baseline model is built for a given system, the model can be changed quickly to address different load or usage profiles and to determine the overall affect on the vehicle and its performance. Tracked vehicles present a number of challenges, however, due to the large number of interactions between all the track and suspension components. Prior methods for analyzing tracked vehicle performance through M&S led to either simplified vehicle models or very long compute times due to the level of detail required to properly model tracked vehicles. RecurDyn offers a number of potential benefits by using a recursive dynamic formulation which takes advantage of the fact that every track shoe is the same and that each track segment is connected to one another in the same manner. The software exploits this symmetry to greatly reduce model development times, complexity, and computational run times. RecurDyn features a user-friendly, graphical user interface (GUI), or front end, and a track-building toolkit (a.k.a. Trackbuilder). This front end saves time building the models by eliminating repeated processes, allowing the user to define one track segment and repeat it around the track loop. The software package also includes a built-in control program called CoLink, which can be used to control and drive vehicle models. A methodology and library of standard templates were developed by the author to enhance the usability of RecurDyn specific to tracked vehicles. The end result is a dramatic decrease in tracked vehicle model build and run times, which in many cases makes simulation a faster, more cost effective option than the build-test-break-fix-test cycle of the past. These methodologies and templates are intended to serve as a reference for future TARDEC engineers learning to model tracked vehicles. To date, these templates include: path following terrain profiles, NATO double lane change, side slopes, performance on grades, and steady state turning circles. Additional events will be programmed as needed and added to the library. The final conclusion of this effort is that RecurDyn is both useful and powerful, and that RecurDyn may be the future for 3-Dimensional multi-body dynamics M&S work for tracked vehicles. Read more here: https://enginsoftusa.com/pdfs/Track-Vehicle-Dynamics-at-US%20Army-with-RecurDyn.pdf