Evaluation of two unsteady numerical approaches for the simulation of multi-frequency turbomachinery flows

International audienceThis paper presents two numerical methods allowing unsteady blade row simulations with a reduction of the computational domain to one blade passage per row: the multiple frequency phase-lagged approach and the harmonic balance time approach implemented in elsA CFD code. The first part of the paper reminds the principle of the two methods, their main hypothesis and their theoretical limitations. The second part of the paper presents the application of these two methods on the 3.5 stage axial experimental compressor CREATE investigated at Ecole Centrale de Lyon in LMFA laboratory. The results obtained with the simplified unsteady models are analyzed and compared to an unsteady reference multiple passage computation and with a steady mixing plane approach. The comparison of these results enables to highlight the interests of these two unsteady numerical approaches and also to underline their limits

Psychometric properties of the French Infant-Toddler Working Alliance Inventory Short version (IT-WAI-S)

International audienceObjective: Therapeutic alliance has been little investigated in infant and toddler therapy, with no tools specifically adapted to this population. However, we have developed the Infant-Toddler Working Alliance Inventory-Short form (IT-WAI-S) which is based on the Working Alliance Inventory. The aim of this study was to assess the psychometric properties of this original French tool, in its two versions: for parent (IT-WAI-SP) and for therapist (IT-WAI-STh). Method: This study included 227 families consulting with their 18-48-month-old child for emotional or behavioral disorders. The scales were filled in at the first three therapy sessions. The IT-WAI-S acceptability, internal validity, reliability and predictive validity (association with child and motheru2019s outcomes) were evaluated. Results: Confirmatory then exploratory factor analyses revealed a three-factor structure for the both scales: Negative Experience of Care Relationship, Positive Alliance and Alliance with the Child. Acceptability, reproducibility and construct validity were satisfactory for both versions. The two versions predicted the child s outcome. The IT-WAI-SP predicted also the mother's outcome. The IT-WAI-STh gave more reproducible results, whereas the IT-WAI-SP was a better predictor of the child s progress. Conclusion: The two IT-WAI-S versions showed good psychometric properties and could be used to study the therapeutic alliance in young children